Western Digital Re EX800M Product manual

Technical Reference Manual
WD Re™EX800M
Datacenter Capacity HDD
WD4000FYYZ
WD4000FDYZ
WD3000FYYZ
WD3000FDYZ
WD2000FYYZ
WD2000FDYZ

© 2013 Western Digital Technologies, Inc.
All Rights Reserved
Information furnished by WD is believed to be accurate and reliable. No license is granted by implication or otherwise
under any patent or patent rights of WD. WD reserves the right to change specifications at any time without notice.
Western Digital, WD, and the WD logo are registered trademarks in the U.S. and other countries; and WD Re,
IntelliSeek, NoTouch, RAFF, StableTrac, Data Lifeguard, CacheFlow, and FIT Lab are trademarks of Western Digital
Technologies, Inc. Other marks may be mentioned herein that belong to other companies.
Western Digital
3355 Michelson Drive, Suite 100
Irvine, California 92612
2679-771339-A05
Document Control Number Definition:
2679-771xxx- Axx-Px NRD
Doc Control No. Doc Revision Level Non-Released Document
Axx = Released Version
Px = Review Cycle

2679-771339-A05 RELEASED 8/12/13
WD Re EX800M
Technical Reference Manual

RELEASED 8/12/13 2679-771339-A05

EX800M Table of Contents
2679-771339-A05 RELEASED 8/13/13 i
TABLE OF CONTENTS
1. DESCRIPTION AND FEATURES ................................................................................................. 1
1.1 General Description....................................................................................................................................................................... 1
1.2 Product Features ............................................................................................................................................................................ 1
2. SPECIFICATIONS....................................................................................................................... 4
2.1 Performance Specifications ......................................................................................................................................................... 4
2.2 CacheFlow™ .................................................................................................................................................................................... 5
2.2.1 Write Cache..................................................................................................................................................................... 5
2.2.2 Read Cache ..................................................................................................................................................................... 5
2.3 Mechanical Specifications............................................................................................................................................................ 6
2.3.1 Physical Dimensions ...................................................................................................................................................... 7
2.3.2 Drive Mounting ................................................................................................................................................................ 7
2.4 Electrical Specifications................................................................................................................................................................ 8
2.4.1 5-disk Platform ................................................................................................................................................................ 8
2.4.2 3-disk Platform ................................................................................................................................................................ 9
2.4.3 Power Savings Modes................................................................................................................................................... 9
2.4.4 Input Voltage Requirements.......................................................................................................................................10
2.4.5 Ripple...............................................................................................................................................................................11
2.4.6 Power Connectors and Cables.................................................................................................................................11
2.4.7 Device Plug Connector Pin Definitions ...................................................................................................................12
2.5 Environmental Specifications.....................................................................................................................................................13
2.5.1 Shock and Vibration .....................................................................................................................................................13
2.5.2 Temperature and Humidity .........................................................................................................................................14
2.5.3 Temperature Measurement.........................................................................................................................................14
2.5.4 Cooling............................................................................................................................................................................15
2.5.5 Atmospheric Pressure .................................................................................................................................................15
2.5.6 Acoustics ........................................................................................................................................................................15
2.5.7 RoHS (Restriction of Hazardous Substances) ......................................................................................................15
2.6 Agency Approvals.........................................................................................................................................................................16
2.7 Full Model Number Specification..............................................................................................................................................16
3. PRODUCT FEATURES.............................................................................................................. 17
3.1 SATA 6 Gb/s.................................................................................................................................................................................18
3.2 Optional Self Encrypting Drive (SED)......................................................................................................................................18
3.3 Time-Limited Error Recovery (TLER) .......................................................................................................................................18
3.4 Rotary Acceleration Feed Forward (RAFF)™ .........................................................................................................................19
3.5 Perpendicular Magnetic Recording (PMR).............................................................................................................................19
3.6 IntelliSeek .......................................................................................................................................................................................20
3.7 StableTrac (Double-tied Shaft Motor) .....................................................................................................................................20
3.8 Native Command Queuing (NCQ)...........................................................................................................................................20
3.9 Pre-emptive Wear Leveling (PWL) ..........................................................................................................................................20
3.10 MicroFemto Slider ........................................................................................................................................................................20
3.11 S.M.A.R.T. Command Transport (SCT)...................................................................................................................................21
3.11.1 Write Same ....................................................................................................................................................................21
3.11.2 Temperature Reporting................................................................................................................................................21
3.12 World Wide Name (WWN) .......................................................................................................................................................21
3.13 Hot Plug Support..........................................................................................................................................................................21
3.14 Active LED Status ........................................................................................................................................................................22
3.15 Fluid Dynamic Bearings (FDB)..................................................................................................................................................22
3.16 Staggered Spinup and Activity Indication (SATA Power Pin 11) .....................................................................................22
3.16.1 Staggered Spinup ........................................................................................................................................................22
3.16.2 Activity Indication ..........................................................................................................................................................22
3.17 48-bit Logical Block Addressing (LBA) ..................................................................................................................................23
3.18 Self-Monitoring, Analysis, and Reporting Technology (S.M.A.R.T.)..................................................................................23
3.19 Password Security Mode............................................................................................................................................................23
3.19.1 Master and User Passwords ......................................................................................................................................23
3.19.2 Security Levels ..............................................................................................................................................................23

ii RELEASED 8/13/13 2679-771339-A05
Table of Contents EX800M
3.20 Optional Model: Self Encrypting Drive (SED)........................................................................................................................24
3.20.1 Security Mode FDE ......................................................................................................................................................24
3.20.2 Sanitize Device Feature Set .......................................................................................................................................24
3.21 Data Path Protection (DPP) .......................................................................................................................................................24
3.22 Manufacturing Option Block ......................................................................................................................................................24
4. RELIABILITY............................................................................................................................. 25
4.1 Reliability Specifications .............................................................................................................................................................25
4.2 Error Rates .....................................................................................................................................................................................25
4.2.1 Error Rates......................................................................................................................................................................26
4.2.2 Environmental Interference .........................................................................................................................................27
4.3 Reliability Features Set................................................................................................................................................................27
4.3.1 Data Lifeguard™ ............................................................................................................................................................27
4.3.2 Thermal Management ..................................................................................................................................................27
4.3.3 Internal Environmental Protection System ..............................................................................................................27
4.3.4 Defect Management.....................................................................................................................................................27
4.3.5 Recoverable Errors.......................................................................................................................................................28
4.3.6 Unrecoverable Errors ...................................................................................................................................................28
4.3.7 Automatic Defect Retirement.....................................................................................................................................28
4.3.8 Error Recovery Process...............................................................................................................................................28
5. ATA COMMAND SET ............................................................................................................. 29
5.1 Host Interface Commands .........................................................................................................................................................29
5.1.1 ATA-7/ATA-8 Commands ..........................................................................................................................................29
5.1.2 SATA Commands.........................................................................................................................................................30
5.1.3 Obsolete Commands...................................................................................................................................................30
5.1.4 SCT Commands ...........................................................................................................................................................31
5.2 S.M.A.R.T. (B0h)...........................................................................................................................................................................31
5.2.1 Read Attribute Values Sub-Command ....................................................................................................................31
5.2.2 Supported Attributes ...................................................................................................................................................33
5.2.3 Read Log Sector...........................................................................................................................................................34
5.3 Identify Device (ECh)...................................................................................................................................................................35
5.4 Set Features (EFh) ......................................................................................................................................................................42
6. DRIVE HANDLING AND MAINTENANCE.................................................................................. 43
6.1 Unpacking ......................................................................................................................................................................................43
6.1.1 Handling Precautions...................................................................................................................................................43
6.1.2 Inspection of Shipping Container .............................................................................................................................43
6.1.3 Removal From Shipping Container...........................................................................................................................43
6.1.4 Removal From Static Shielding Bag.........................................................................................................................44
6.1.5 Moving Precautions......................................................................................................................................................44
6.2 Hard Drive Installation..................................................................................................................................................................44
6.2.1 Backplane Usage .........................................................................................................................................................45
6.3 Maintenance...................................................................................................................................................................................46
7. TECHNICAL SUPPORT............................................................................................................. 47
7.1 WD Online Services ....................................................................................................................................................................47
8. GLOSSARY .............................................................................................................................. 48

2679-771339-A05 RELEASED 8/13/13 iii
EX800M List of Figures
LIST OF FIGURES
Figure 2-1 Mounting Dimensions...........................................................................................................................................6
Figure 2-2 Standard Factory Connectors ......................................................................................................................... 12
Figure 2-3 Drive Base Casting Thermocouple Location ............................................................................................... 14
Figure 2-4 Forced Airflow Direction ................................................................................................................................... 15
Figure 3-1 Dual Linear Sensor Rotational Acceleration Feed Forward (RAFF) ....................................................... 19
Figure 3-2 Manufacturing Option Block............................................................................................................................ 24
Figure 6-1 SATA Cable Connections................................................................................................................................ 44
Figure 6-2 Connector Pair Blind Mate Misalignment Allowable.................................................................................. 45
Figure 6-3 Device Backplane Connection........................................................................................................................ 45

iv RELEASED 8/13/13 2679-771339-A05
List of Tables EX800M
LIST OF TABLES
Table 2-1 Physical Specifications..........................................................................................................................................4
Table 2-2 Performance Specifications .................................................................................................................................4
Table 2-3 Device Pin Connector Pin Definitions............................................................................................................. 12
Table 2-4 Shock and Vibration ............................................................................................................................................ 13
Table 2-5 Maximum and Reliability Operating Temperature Limits (Drive Baseplate) ........................................... 14
Table 2-6 Full Model Number Description........................................................................................................................ 16
Table 5-1 ATA-7/ATA-8 Command Opcodes................................................................................................................. 29
Table 5-2 Optional Subcommands ................................................................................................................................... 30
Table 5-3 Obsolete Command Opcodes ......................................................................................................................... 30
Table 5-4 SCT Action Codes .............................................................................................................................................. 31
Table 5-5 Definitions for the 512 Bytes. ........................................................................................................................... 31
Table 5-6 Supported Attributes........................................................................................................................................... 33
Table 5-7 Log Address Definition ....................................................................................................................................... 34
Table 5-8 Identify Device Command.................................................................................................................................. 35

EX800M Description and Features
2679-771339-A05 RELEASED 8/13/13 1
1.0 DESCRIPTION AND FEATURES
1.1 General Description
WD Re datacenter hard drives offer up to 4 TB capacities and are available with SAS or SATA
interface. With the highest error tolerance and MTBF of any capacity-optimized drive, WD Re delivers
the durability and 24x7x365 reliability required in tightly packed vibration prone multi-drive systems.
The combination of high-capacity, peak performance and robust design make WD Re drives ideal for
heavy workload environments, cloud storage, RAID arrays, external storage arrays, data warehousing
and mining applications.
1.2 Product Features
Optional Self Encrypting Drive (SED) — Utilizing an AES 256 bit encryption engine for Crypto
erase capability, WD supports both industry standard commands of the Sanitize Feature Set and
also the Security Feature Set which utilizes the Secure Erase Unit (SEU) enhanced mode bit.*
Serial ATA (SATA) — Serial ATA (SATA) is the next generation bus interface for hard drives. It is
designed to replace Parallel ATA, and has many advantages including increased transfer rate,
improved signal integrity, enhanced data protection, and hot plug support.
Time-Limited Error Recovery (TLER) — TLER prevents hard drive error recovery fallout by
limiting the time the drive spends in error recovery, providing increased performance, improved
availability, and lower total cost of ownership in RAID arrays.
Rotary Acceleration Feed Forward (RAFF) — These drives employ RAFF technology to maintain
hard drive performance in high vibration environments through adaptive compensation of the
servo system.
Perpendicular Magnetic Recording (PMR) — With PMR technology the magnetization of each
data bit is aligned vertically to the spinning disk, rather than longitudinally as has been the case in
hard drive technology for decades. This enables more data on a given disk than is possible with
conventional longitudinal recording, and provides a platform for future expansion of hard drive
densities.
IntelliSeek™ — Key product feature that calculates optimum seek speeds to lower power
consumption, noise, and vibration.
StableTrac™ — The motor shaft is secured at both ends to reduce system-induced vibration and
stabilize platters for accurate tracking, during read and write operations.
Native Command Queuing (NCQ) — Performance of a random I/O workload can be improved
through intelligent re-ordering of the I/O requests so they read/write to and from the nearest
available sectors and minimize the need for additional disk revolutions or head actuator
movement. This improvement can be achieved though Native Command Queing (NCQ) , which
is supported by these hard drives.
Pre-emptive Wear Leveling (PWL) — This WD feature provides a solution for protecting the
recording media against mechanical wear. In cases where the drive is so busy with incoming
commands that it is forced to stay in a same cylinder position for a long time, the PWL control
engine initiates forced seeks so that disk lubricant maintains an even distribution and does not
become depleted. This feature ensures reliability for applications that perform a high incidence of
read/write operations at the same physical location on the disk.
*SED drives may require TCG-compliant host or controller support. SED drives may not be available in all countries

Description and Features EX800M
2 RELEASED 8/13/13 2679-771339-A05
MicroFemto Slider — These drives incorporate the next generation of femto slider form factor in
which the read/write head is mounted on the small, lightweight microfemto slider that allows the
head to move more quickly from track to track on the disk.
S.M.A.R.T. Command Transport (SCT) — The SCT Command Transport feature set provides a
method for a host to send commands and data to a device and for a device to send data and status
to a host using log pages.
World Wide Name (WWN) — The World Wide Name (WWN) defined in ATA/ATAPI-7 is a
modification of the IEEE extended unique identifier 64 bit standard (EUI-64) and is comprised of
three major components: naming authority, organizationally unique identifier (OUI) and serial
number. WD's OUI is 0014EEh.
Reliability Features Set-Data Lifeguard™ — Representing WD's ongoing commitment to data
protection, Data Lifeguard includes features that enhance the drive’s ability to prevent data loss.
Data Lifeguard data protection utilities include thermal management, an environmental
protection system, and embedded error detection and repair features that automatically detect,
isolate, and repair problem areas that may develop over the extended use of the hard drive. With
these enhanced data reliability features, the drive can perform more accurate monitoring, error
repair, and deliver exceptional data security.
Hot Plug Support — SATA supports hot plugging (also known as “hot swapping”), the ability to
swap out a failed hard drive without having to power down the system or reboot. This capability
contributes to both data availability and serviceability without any associated downtime, making it
a critical feature for extending SATA into enterprise applications.
Active LED Status — The drive supports external LED requirements. It provides an activity LED
output which is ON during command execution and OFF otherwise.
Fluid Dynamic Bearings (FDB) — Bearing design that incorporates a layer of high-viscosity
lubricant instead of ball bearings in the hard drive spindle motor. As an alternative to conventional
ball bearing technology, FDB designs provide increased non-operational shock resistance, speed
control, and improved acoustics.
Staggered Spin-Up — Next generation SATA 6 Gb/s feature that allows the system to control
whether the drive will spin up immediately or wait until the interface is fully ready.
CacheFlow™ —WD’s unique, multi-generation caching algorithm evaluates the way data is read
from and written to the drive and adapts “on-the-fly” to the optimum read and write caching
methods. CacheFlow minimizes disk seek operations and overheads due to rotational latency.
CacheFlow supports sequential and random write cache. With write cache and other CacheFlow
features, the user can cache both read and write data. The cache can hold multiple writes and
collectively write them to the hard disk.
48-bit Logical Block Addressing (LBA) — WD SATA drives support both 48-bit and 28-bit LBA
and CHS-based addressing. LBA is included in advanced BIOS and operating system device
drivers and ensures high capacity disk integration.
Power Management — The drive supports the ATA and SATA power management command
set, allowing the host to reduce the power consumption of the drive by issuing a variety of power
management commands.
Self-Monitoring, Analysis, and Reporting Technology (S.M.A.R.T.) — S.M.A.R.T. enables a
drive’s internal status to be monitored through diagnostic commands at the host level and during
offline activities. S.M.A.R.T. devices employ data analysis algorithms that are used to predict the
likelihood of some near-term degradation or fault conditions. When used with a S.M.A.R.T.
application, the drive can alert the host system of a negative reliability status condition. The host
system can then warn the user of the impending risk of data loss and recommend an appropriate
action.

EX800M Description and Features
2679-771339-A05 RELEASED 8/13/13 3
ATA Security — The drive supports the ATA Security Mode Feature set. The ATA Security Mode
feature set allows the user to create a device lock password that prevents unauthorized hard disk
access even if the drive is removed from the host computer. The correct password must be
supplied to the hard drive in order to access user data. Both the User and Master Password features
are supported, along with the High and Maximum security modes. The Master Password Revision
code is also supported. This feature varies by drive configuration and may not be available on all
configurations.
Data Path Protection (DPP) — A feature that prevents possible electronic failures from
corrupting data on the hard drive.

Specifications EX800M
4 RELEASED 8/13/13 2679-771339-A05
2.0 SPECIFICATIONS
Table 2-1. Physical Specifications
2.1 Performance Specifications
Table 2-2. Performance Specifications
Physical Specifications1WD4000FYYZ
WD4000FDYZ2WD3000FYYZ WD3000FDYZ2WD2000FYYZ WD2000FDYZ2
Capacity 4 TB 3 TB 2 TB
Interface SATA 6 Gb/s SATA 6 Gb/s SATA 6 Gb/s
Disk count platform 5-disk 5-disk 3-disk
Number of Heads 10 8 6
Bytes per sector 512 512 512
User Sectors per Drive 7,814,037,168 5,860,533,168 3,907,029,168
Servo Type Embedded Embedded Embedded
Channel Recording Method LDPC–Low Density Parity Code
1 As used for storage capacity, one megabyte (MB) = one million bytes, one gigabyte (GB) = one billion bytes, and
one terabyte (TB) = one trillion bytes. Total accessible capacity varies depending on operating environment. As
used for buffer or cache, one megabyte (MB) = 1,048,576 bytes. As used for transfer rate or interface, megabyte
per second (MB/s) = one million bytes per second, and gigabit per second (Gb/s) = one billion bits per second.
Effective maximum SATA 6 Gb/s transfer rate calculated according to the Serial ATA specification published by the
SATA-IO organization as of the date of this document. Visit www.sata-io.org for details.
2 Optional SED model.
Average Seek (without overhead)
- Read
- Write 7.7 ms average 8.3 ms average
Average Latency 4.2 ms (nominal)
Rotational Speed 7200 RPM (nominal)
Data Transfer Rate (maximum at OD) 1
- Maximum burst interface transfer rate
- Maximum sustained interface transfer rate
6 Gb/s
WD4000FxYZ: 171 MB/s
WD3000FxYZ: 168 MB/s
WD2000FxYZ: 164 MB/s
Buffer Size 64 MB
Error Rate - Unrecoverable <10 in 1016 bits read
Spindle Start Time
- From Power-on to Drive Ready 2 15s average (FAST spinup mode)
20s average (STANDARD spinup mode)
Spindle Stop Time <15s average
Load/Unload Cycles3600,000 minimum
1As used for transfer rate or interface, megabyte per second (MB/s) = one million bytes per second, and gigabit
per second (Gb/s) = one billion bits per second. Effective maximum SATA 6 Gb/s transfer rate calculated
according to the Serial ATA specification published by the SATA-IO organization as of the date of this document.
Visit www.sata-io.org for details.
2Defined as the time from power-on to the setting of Drive Ready and Seek Complete including calibration.
3Controlled unload at ambient condition.

EX800M Specifications
2679-771339-A05 RELEASED 8/13/13 5
2.2 CacheFlow™
CacheFlow is WD’s unique, multi-generation disk caching system. It incorporates read cache with
write cache.
WD designed CacheFlow to obtain maximum performance with today’s most popular operating
systems and applications. CacheFlow increases performance over prior caching algorithms by
increasing the number of times that requested data is in the cache. This reduces the number of host
commands that require actual media access thereby improving overall drive performance.
Typical applications perform a variety of access patterns, such as random, sequential, and repetitive.
CacheFlow is designed to dynamically adapt to the changes in access patterns that occur during the
course of application execution.
Random mode is the default operational mode for CacheFlow. Once CacheFlow detects a sequential
access pattern, it leaves random mode. CacheFlow also performs predictive read operations to increase
the probability that data requested in future commands already exists in the cache.
CacheFlow partitions the buffer into multiple segments to allow for the fact that applications may
access multiple non-contiguous areas on the disk. CacheFlow tracks the amount of valid data in each
segment and controls the deallocation of segments to maximize drive performance.
2.2.1 Write Cache
CacheFlow is designed to improve both single and multi-sector write performance by reducing delays
caused by seek time and rotational latency.
The write cache adaptively detects random and sequential access patterns during application execution.
If a defective sector is found during a write cache operation, that sector is automatically relocated before
the write occurs.
2.2.2 Read Cache
CacheFlow implements a multiple segment read cache. Cache segments are assigned to read commands
as they are received from the host.
Each read segment consists of pre and post read sectors in addition to the host-requested sectors. This
maximizes the amount of cache data in the drive’s buffer, thereby increasing the likelihood of cache hits
and improving overall performance.

Specifications EX800M
6 RELEASED 8/13/13 2679-771339-A05
2.3 Mechanical Specifications
Figure 2-1 shows the mounting dimensions and locations of the screw holes for the drive.
Figure 2-1. Mounting Dimensions
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EX800M Specifications
2679-771339-A05 RELEASED 8/13/13 7
2.3.1 Physical Dimensions
2.3.2 Drive Mounting
Use either the four bottom screws or at least four of the side mounting screws to rigidly support the
drive and prevent vibration. Some adaptor frames may not have the mechanical design structure
capable of mounting the drive to meet the specified shock and vibration requirements.
The hard drive itself does not provide electrical isolation between mounting locations and drive ground
connection. If electrical isolation is required, the system designer or integrator would be responsible for
providing a solution.
2.3.2.1 Mounting Restrictions
If your system does not support hot plugging (see “Hot Plug Support” on page 21), it must be turned
off and unplugged before installing your hard drive.
2.3.2.2 Orientation
You can mount the hard drive in the X, Y, or Z axis, depending upon the physical design of your
system. For best results, mount the drive with all four screws grounded to the chassis. If all four screws
are not used, see "Grounding" on page 7.
2.3.2.3 Screw Type and Screw Length Limitations
The hard drive should be mounted to the chassis using four 6-32 screws. Recommended screw torque
is 5 in-lb. Maximum screw torque is 10 in-lb.
2.3.2.4 Grounding
The PCBA and HDA grounds are always connected together in the drive and cannot be disconnected.
The drive mounting screws, unless intentionally isolated, will provide additional ground connections
between the HDA and the system chassis. If the drive isn't grounded via mounting screws as described
under “Hard Drive Installation” on page 44, there may be increased electrical emissions (EMI).
English Metric
Dimension Tolerance Dimension Tolerance
Height 1.028 inches MAX 26.1 mm MAX
Length 5.787 inches MAX 147.0 mm MAX
Width 4.00 inches ±0.01 inch 101.6 mm ±0.25 mm
Weight (3-disk) 1.55 pounds ±5% 0.70 kg ±5%
Weight (5-disk) 1.66 pounds ±5% 0.75 kg ±5%
CAUTION: Screws that are too long can damage the hard drive. Hard drive screw penetration
can differ between products depending upon hard drive design. WD’s minimum design criteria is
to always meet the SFF 8301 industry standard specification. The industry standard as defined in
the SFF 8301 specifies a maximum of 3 mm screw penetration, and for a minimum of 2.4 mm of
thread engagement from both the screw and the hard drive.
See Figure 2-1 for allowable fastener penetration for this product family.

Specifications EX800M
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2.4 Electrical Specifications
2.4.1 5-disk Platform
2.4.1.1 Mean Current Requirements and Power Dissipation
2.4.1.1.1 Power Savings Modes1
Operating Mode Mean Current1, 2 Mean Power1, 2
12 VDC 5 VDC
Spinup Standard31.900A (max)
1.225A 625 mA (peak) 220 mA -
Spinup Fast 2.500A (max)
1.600A 625 mA (peak) 220 mA -
Spinup Green 1.200A (max)
775 mA 625 mA (peak) 220 mA -
Operational Peak Current 2.000A (peak)
2125 mA (max) 850 mA (peak) 950 mA (max) -
Sequential Read 575 mA 650 mA 10.2W
Sequential Write 575 mA 550 mA 9.7W
Random Read/Write 750 mA 370 mA 10.9W
Idle 575 mA 340 mA 8.6W
1When running at 3 Gb/s or as a single ported device, power will be lower than the value listed.
2All peak and mean values are typical (measured at 25°C) except where specified as maximum.
3Default spinup mode when not otherwise overridden. Use the WDSpinUp utility to modify the
spinup mode for individual drives. Go to http://support.wdc.com, then click on "Downloads" and
the drive family name to download this utility.
Mode Mean Current2Mean Current2Mean Power2
DIPM Off
12 VDC 5 VDC
Idle_A 575 mA 230 mA 7.5W
Idle_B 475 mA 220 mA 6.8W
Idle_C 400 mA 220 mA 5.9W
Standby_Y 230 mA 220 mA 3.9W
Standby_Z 7 mA 210 mA 1.1W
1When running at 3 Gb/s or as a single ported device, power will be lower than the value listed.
2All peak and mean values are typical (measured at 25°C) except where specified as maximum.

EX800M Specifications
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2.4.2 3-disk Platform
2.4.2.1 Mean Current Requirements and Power Dissipation
2.4.2.1.1 Power Savings Modes1
2.4.3 Power Savings Modes
This product is capable of supporting both legacy ATA Advanced Power Management (APM) mode
and the new more extensive Extended Power Conditions (EPC) standards. Unless otherwise specified,
the default disk drive is shipped with the legacy APM mode enabled, and the EPC modes can be
enabled via the Set Feature command (Feature ‘4A’h, Sub Command ‘04’h). These two power savings
implementations are exclusively used, and thus not simultaneously supported.
2.4.3.1 SATA Advanced Power Management
This drive supports the legacy ATA power management commands that lower the average power
consumption of the hard drives. For example, to take advantage of the lower power consumption
modes of the drive, an energy efficient host system could implement a power management scheme that
issues a Standby Immediate command when a host resident disk inactivity timer expires. The Standby
Immediate command causes the drive to spin down and enter a low-power mode. Subsequent disk
access commands would cause the drive to spin up and execute the new command. To avoid excessive
wear on the drive due to the starting and stopping of the HDA, set the host’s disk inactivity timer to no
shorter than ten minutes.
Operating Mode Mean Current1, 2 Mean Power1, 2
12 VDC 5 VDC
Spinup Standard31.900A (max)
1.225A 625 mA (peak) 220 mA -
Spinup Fast 2.500A (max)
1.600A 625 mA (peak) 220 mA -
Spinup Green 1.200A (max)
775 mA 625 mA (peak) 220 mA
Operational Peak Current 1.850A (peak)
1.925 mA (max) 825 mA (peak) 875 mA (max) -
Sequential Read 400 mA 650 mA 8.1W
Sequential Write 400 mA 575 mA 7.7W
Random Read/Write 600 mA 360 mA 9W
Idle 390 mA 350 mA 6.4W
1When running at 3 Gb/s or as a single ported device, power will be lower than the value listed.
2All values are typical (measured at 25°C) except where specified as maximum.
3Default spinup mode when not otherwise overridden. Use the WDSpinUp utility to modify the
spinup mode for individual drives. Go to http://support.wdc.com, then click on "Downloads" and
the drive family name to download this utility.
Mode Mean Current2Mean Current2Mean Power2
DIPM Off
12 VDC 5 VDC
Idle_A 350 mA 230 mA 5.4W
Idle_B 320 mA 220 mA 4.9W
Idle_C 270 mA 220 mA 4.3W
Standby_Y 150 mA 220 mA 2.9W
Standby_Z 7 mA 210 mA 1.1W
1When running at 3 Gb/s or as a single ported device, power will be lower than the value listed.
2All values are typical (measured at 25°C) except where specified as maximum.

Specifications EX800M
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The drive also supports the SATA power management feature that lowers the average power
consumption of the SATA interface.
2.4.3.2 SATA Extended Power Conditions (EPC)
WD drives additionally support T13 Extended Power Conditions, as stated in the ACS-2 specification.
Power savings features, normally only available in notebook drives, are now included in our Enterprise
products. With these features enabled, drive power can be reduced automatically via inactivity timer, or
manually via Host command. In timer based mode, the drive automatically starts reducing its power
based on inactivity of commands from the Host. With progression into the idle states, the drive saves
more and more power, but consequently takes longer to recover and respond to Host media
commands.
A summary of the new low power modes and what the drive does in each mode is shown below:
Idle_A
Heads Floating Over Disk
<10 ms recovery
Idle_B
Heads Parked
<650 ms recovery
Idle_C
Heads Parked, Reduced RPM
3-15 sec recovery (see the Power Conditions Log for the drives actual recovery time)
Idle_c recovery current limited to the maximum user mode power.
Standby_Y
Heads Parked, Reduced RPM
3-15 sec recovery (see the Power Conditions Log for the drives actual recovery time)
Standby_y recovery can use full spin up power.
Standby_Z
Traditional standby
Drive not spinning
Recovery is similar to a typical TTR (Time To Ready) for the HDD
WD has added the Power Condition Log, which defines the support, enable bits, and timers for all
power conditions. The power management timers start running after all Host commanded drive
activity is complete, and will run during drive background operations, but do not take effect until those
background operations are completed. The timer expiration min/max values are visible to the Host/
Initiator, but are rounded silently by the drive to its internal min/max values. The timer enable and
timer values can be marked independently as changeable. Please note that some Host Operating
Systems may be unable to take advantage of the inactivity timers, as they constantly ping the Drive
with writes to update a time stamp. In these situations it is advisable to extend the Idle_B timer value
beyond the time interval of the writes, or to disable the timer entirely. Please see your WD
representative for help with questions about these features.
2.4.4 Input Voltage Requirements
The input voltage requirements are +5.0V ± 5% and +12.0V ± 10%.

EX800M Specifications
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2.4.5 Ripple
2.4.6 Power Connectors and Cables
SATA Connectors
For information on SATA data connectors, refer to the Serial ATA 1.0 specification available for
download at www.serialata.org.
At the time of this printing, there are no published standards for SATA power/mating connectors or
power/data cable wire gauges.
Cabling Requirements for SATA
The SATA cable consists of four conductors in two differential pairs. The cable may also include drain
wires to be terminated to the ground pins in the SATA cable receptacle connectors. See the SATA 1.0
specification for cable specifications. The cable's maximum length is one meter.
It is recommended that customers use SATA cable receptacles with internal bumps to provide
additional retention when mating with an enterprise hot-plug optimized hard drive connector.
+12 VDC +5 VDC
Maximum
Frequency 200 mV (double amplitude) 0-30 MHz 100 mV (double amplitude) 0-30 MHz

Specifications EX800M
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2.4.7 Device Plug Connector Pin Definitions
These drives interface with the host I/O bus via the SATA interface connection illustrated in Figure 2-
2 below. The drive receives power from the SATA power connection or legacy ATA
4-pin power connector J3 in Figure 2-2. Table 2-3 identifies the pin definitions of the SATA
connectors and the corresponding signal names and signal functions.
Figure 2-2. Standard Factory Connectors
Table 2-3. Device Pin Connector Pin Definitions
Signal segment
S1 Gnd 2nd mate
S2 A+ Differential signal pair A from Phy
S3 A-
S4 Gnd 2nd mate
S5 B- Differential signal pair B from Phy
S6 B+
S7 Gnd 2nd mate
Key and spacing separate signal and power segments
Power segment
P1 V33 3.3 V power, NC
P2 V33 3.3 V power, NC
P3 V33 3.3 V power, pre-charge, 2nd mate, NC
P4 Gnd 1st mate, GROUND
P5 Gnd 2nd mate, GROUND
P6 Gnd 2nd mate, GROUND
P7 V55V power, Precharge, 2nd mate
P8 V55V power
P9 V52nd mate, 5V power
P10 Gnd 2nd mate, GROUND
P11 ACT- Activity LED- (O.C.)/Staggered Spin-up Disable Control
P12 Gnd 1st mate, GROUND
P13 V12 12 V power, pre-charge, 2nd mate
P14 V12 12 V power
P15 V12 12 V power