Western Digital WD1002FBYS Product manual

Technical Reference Manual
WD CONFIDENTIAL
WD RE3 XL333M
Enterprise SATA Hard Drives
WD1002FBYS
WD7502ABYS

© 2008 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, the WD logo, and WD Caviar are registered trademarks in the U.S. and other countries;
and 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
20511 Lake Forest Drive
Lake Forest, CA 92630
2679-701179-A01
Document Control Number Definition:
2679-001xxx- 0xx-Px NRD
Doc Control No. Doc Revision Level Non-Released Document
Oxx = Released Version
Px = Review Cycle
WD CONFIDENTIAL

2679-701179-A01 RELEASED 11/13/08 (WD CONFIDENTIAL)
WD RE3 XL333M
WD1002FBYS
WD7502ABYS
Technical Reference Manual

RELEASED 11/13/08 (WD CONFIDENTIAL) 2679-701179-A01

WD RE3 XL333M Table of Contents
2679-701179-A00 RELEASED 7/23/08 (WD CONFIDENTIAL) i
TABLE OF CONTENTS
1. DESCRIPTION AND FEATURES ................................................................................................. 1
1.1 General Description....................................................................................................................................................................... 1
1.2 Product Features ............................................................................................................................................................................ 2
2. SPECIFICATIONS....................................................................................................................... 4
2.1 Performance Specifications ......................................................................................................................................................... 4
2.2 Physical Specifications1............................................................................................................................................................... 5
2.2.1 Physical Dimensions ...................................................................................................................................................... 6
2.3 Mechanical Specifications............................................................................................................................................................ 7
2.4 Electrical Specifications................................................................................................................................................................ 8
2.4.1 Mean Current Requirements and Power Dissipation............................................................................................. 8
2.4.2 Input Voltage Requirements......................................................................................................................................... 9
2.4.3 Ripple................................................................................................................................................................................. 9
2.4.4 Power Connectors and Cables................................................................................................................................... 9
2.5 Environmental Specifications.....................................................................................................................................................10
2.5.1 Shock and Vibration .....................................................................................................................................................10
2.5.2 Temperature and Humidity .........................................................................................................................................11
2.5.3 Thermocouple Location...............................................................................................................................................11
2.5.4 Cooling............................................................................................................................................................................12
2.5.5 Atmospheric Pressure .................................................................................................................................................12
2.5.6 Acoustics ........................................................................................................................................................................12
2.5.7 RoHS (Restriction of Hazardous Substances) ......................................................................................................12
2.6 Reliability Specifications .............................................................................................................................................................12
2.7 Device Plug Connector Pin Definitions ...................................................................................................................................13
2.8 Agency Approvals.........................................................................................................................................................................14
2.9 Full Model Number Specification..............................................................................................................................................14
3. PRODUCT FEATURES.............................................................................................................. 15
3.1 SATA 3 Gb/s.................................................................................................................................................................................16
3.2 Time-Limited Error Recovery (TLER) .......................................................................................................................................16
3.3 Rotary Acceleration Feed Forward (RAFF)™ .........................................................................................................................17
3.4 Perpendicular Magnetic Recording (PMR).............................................................................................................................17
3.5 IntelliSeek .......................................................................................................................................................................................18
3.6 NoTouch Ramp Load Technology ............................................................................................................................................18
3.7 StableTrac (Double-tied Shaft Motor) .....................................................................................................................................18
3.8 Native Command Queuing (NCQ)...........................................................................................................................................18
3.9 Pre-emptive Wear Leveling (PWL) ..........................................................................................................................................18
3.10 Femto Slider...................................................................................................................................................................................19
3.11 S.M.A.R.T. Command Transport (SCT)...................................................................................................................................19
3.11.1 Write Same ....................................................................................................................................................................19
3.11.2 Read/Write Long ..........................................................................................................................................................19
3.11.3 Temperature Reporting................................................................................................................................................19
3.12 World Wide Name (WWN) .......................................................................................................................................................20
3.13 Reliability Features Set................................................................................................................................................................20
3.13.1 Data Lifeguard™ ............................................................................................................................................................20
3.13.2 Thermal Management ..................................................................................................................................................21
3.13.3 Internal Environmental Protection System ..............................................................................................................21
3.13.4 Recoverable Errors.......................................................................................................................................................21
3.13.5 Unrecoverable Errors ...................................................................................................................................................21
3.13.6 Self Test ..........................................................................................................................................................................21
3.13.7 ATA Error Logging........................................................................................................................................................22
3.13.8 Defect Management.....................................................................................................................................................22
3.13.9 Automatic Defect Retirement.....................................................................................................................................22
3.13.10 Error Recovery Process...............................................................................................................................................22
3.14 Hot Plug Support..........................................................................................................................................................................23
3.15 Active LED Status ........................................................................................................................................................................23
3.16 Fluid Dynamic Bearings (FDB)..................................................................................................................................................23

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Table of Contents WD RE3 XL333M
3.17 Staggered Spinup and Activity Indication (SATA Power Pin 11) .....................................................................................23
3.17.1 Staggered Spinup ........................................................................................................................................................24
3.17.2 Activity Indication ..........................................................................................................................................................24
3.18 CacheFlow™ ..................................................................................................................................................................................24
3.18.1 Write Cache...................................................................................................................................................................24
3.18.2 Read Cache ...................................................................................................................................................................25
3.19 48-bit Logical Block Addressing (LBA) ..................................................................................................................................25
3.20 Power Management .....................................................................................................................................................................25
3.21 Self-Monitoring, Analysis, and Reporting Technology (S.M.A.R.T.)..................................................................................25
3.22 Security Mode ...............................................................................................................................................................................25
3.22.1 Master and User Passwords ......................................................................................................................................26
3.22.2 Security Levels ..............................................................................................................................................................26
3.23 Automatic Acoustic Management (AAM)................................................................................................................................26
4. ATA COMMAND SET ............................................................................................................. 27
4.1 Host Interface Commands .........................................................................................................................................................27
4.1.1 ATA-7/ATA-8 Commands ..........................................................................................................................................27
4.1.2 Optional Subcommands .............................................................................................................................................28
4.1.3 Obsolete Commands...................................................................................................................................................28
4.1.4 SCT Commands ...........................................................................................................................................................29
4.2 S.M.A.R.T. (B0h)...........................................................................................................................................................................29
4.2.1 Read Attribute Values Sub-Command ....................................................................................................................29
4.2.2 Supported Attributes ...................................................................................................................................................31
4.2.3 Read Log Sector...........................................................................................................................................................32
4.3 Identify Device (ECh)...................................................................................................................................................................33
4.4 Set Features (EFh) ......................................................................................................................................................................39
5. INSTALLATION AND SETUP PROCEDURES............................................................................. 40
5.1 Unpacking ......................................................................................................................................................................................40
5.1.1 Handling Precautions...................................................................................................................................................40
5.1.2 Inspection of Shipping Container .............................................................................................................................40
5.1.3 Removal From Shipping Container...........................................................................................................................40
5.1.4 Removal From Static Shielding Bag.........................................................................................................................41
5.1.5 Moving Precautions......................................................................................................................................................41
5.2 Mounting.........................................................................................................................................................................................41
5.2.1 Mounting Restrictions..................................................................................................................................................41
5.2.2 Orientation......................................................................................................................................................................41
5.2.3 Screw Size Limitations ................................................................................................................................................41
5.2.4 Grounding.......................................................................................................................................................................42
5.3 Hard Drive Installation..................................................................................................................................................................42
5.3.1 Jumper Settings.............................................................................................................................................................42
5.3.2 Attach the Power Supply Cable................................................................................................................................43
5.3.3 Attach SATA Interface Cable.....................................................................................................................................43
5.4 Serial ATA Latching Connector ................................................................................................................................................43
6. MAINTENANCE ........................................................................................................................ 44
7. TECHNICAL SUPPORT............................................................................................................. 45
7.1 WD Online Services ....................................................................................................................................................................45
8. GLOSSARY .............................................................................................................................. 46

2679-701179-A00 RELEASED 7/23/08 (WD CONFIDENTIAL) iii
WD RE3 XL333M List of Figures
LIST OF FIGURES
Figure 2-1 Mounting Dimensions...........................................................................................................................................7
Figure 2-2 Drive Base Casting Thermocouple Location ............................................................................................... 11
Figure 2-3 Forced Airflow Direction ................................................................................................................................... 12
Figure 2-4 Standard Factory Connectors ......................................................................................................................... 13
Figure 3-1 Dual Linear Sensor Rotational Acceleration Feed Forward (RAFF) ....................................................... 17
Figure 5-1 Jumper Settings .................................................................................................................................................. 42
Figure 5-2 Connector Locations ......................................................................................................................................... 43
Figure 5-3 SATA Interface Cable........................................................................................................................................ 43

iv RELEASED 7/23/08 (WD CONFIDENTIAL) 2679-701179-A00
List of Tables WD RE3 XL333M
LIST OF TABLES
Table 2-1 Shock and Vibration ............................................................................................................................................ 10
Table 2-2 Device Pin Connector Pin Definitions............................................................................................................. 13
Table 2-3 Full Model Number Description........................................................................................................................ 14
Table 4-1 ATA-7/ATA-8 Command Opcodes................................................................................................................. 27
Table 4-2 Optional Subcommands ................................................................................................................................... 28
Table 4-3 Obsolete Command Opcodes ......................................................................................................................... 28
Table 4-4 SCT Action Codes .............................................................................................................................................. 29
Table 4-5 Definitions for the 512 Bytes. ........................................................................................................................... 29
Table 4-6 Defined Error Logging Sectors......................................................................................................................... 32
Table 4-7 Identify Device Command.................................................................................................................................. 33

WD RE3 XL333M Description and Features
2679-701179-A01 RELEASED 11/13/08 (WD CONFIDENTIAL) 1
1.0 DESCRIPTION AND FEATURES
1.1 General Description
WD RE3 7200 RPM Enterprise SATA hard drives are packed with performance and reliability
features making them the perfect solution for servers, video surveillance, and other demanding
write-intensive applications. With a designed, manufactured and demonstrated MTBF of
1.2 million hours at 100% duty cycle in nominal enterprise conditions, up to 32 MB cache,
and best-in-class vibration tolerance, these drives are the ultimate in Enterprise SATA storage.
These hard drives are your best choice for today’s powerful, information-hungry systems
running Windows®2000 Advanced Server, Windows 2003 Server, Windows Vista, Windows
XP, and Windows 2000 operating systems on Intel®Itanium®, Xeon™and Pentium®4 as well
as AMD processors.
WD’s rugged and reliable hard drives are designed and manufactured to the highest
standards of quality and reliability. Built to last, this SATA hard drive is made for years of
cool-running, high-performance operation around the clock. Before shipping, every drive
undergoes over 200 rigorous tests to ensure functionality and compatibility.

Description and Features WD RE3 XL333M
2 RELEASED 11/13/08 (WD CONFIDENTIAL) 2679-701179-A01
1.2 Product Features
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.
NoTouch™ Ramp Load Technology — The recording head never touches the disk
media ensuring significantly less wear to the recording head and media as well as better
drive protection in transit.
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.
Femto Slider — These drives incorporate the femto slider form factor in which the read/
write head is mounted on the small, lightweight femto slider which 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

WD RE3 XL333M Description and Features
2679-701179-A01 RELEASED 11/13/08 (WD CONFIDENTIAL) 3
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 3.0 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.
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.
Automatic Acoustic Management (AAM) — The drive supports the Automatic
Acoustic Management feature. This feature allows the host to select the acoustic level of
the hard drive.

Specifications WD RE3 XL333M
4 RELEASED 11/13/08 (WD CONFIDENTIAL) 2679-701179-A01
2.0 SPECIFICATIONS
2.1 Performance Specifications
Average Latency 4.2 ms (nominal)
Rotational Speed 7200 RPM (nominal)
Data Transfer Rate (maximum) 1
- Buffer to Host
- Host to/from Drive
3 Gb/s maximum
113 MB/s sustained (maximum)
Interleave 1:1
Buffer Size 32 MB
Error Rate - Unrecoverable <1 in 1015 bits read
Spindle Start Time
- From Power-on to Drive Ready 2
- From Power-on to Rotational Speed 3 17s average
9s average
Spindle Stop Time <15s average
Load/Unload Cycles4300,000 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 3 Gb/s transfer rate calculated
according to the Serial ATA specification published by the SATA-IO organization as of the date of this
specification sheet. 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.
3Defined as the time from power-on to when the full spindle rotational speed is reached.
4Controlled unload at ambient condition.

WD RE3 XL333M Specifications
2679-701179-A01 RELEASED 11/13/08 (WD CONFIDENTIAL) 5
2.2 Physical Specifications1
Physical Specifications2WD7502ABYS WD1002FBYS
Capacity 750,156 MB 1,000,204 MB
Interface SATA 3 Gb/s SATA 3 Gb/s
Number of Disks 3 3
Data Surfaces 5 6
Number of Heads 5 6
Bytes per Sector 512 512
User Sectors per Drive 1,465,149,168 1,953,525,168
Servo Type Embedded Embedded
Recording Method EPR4 Rate 16/17 PRML Rate 16/17 PRML
ECC Reed-Solomon Reed-Solomon
Head Park3Automatic Automatic
PRML - Partial Response Maximum Likelihood
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 3 Gb/s transfer rate calculated according to the Serial ATA specification published by the
SATA-IO organization as of the date of this specification sheet. Visit www.sata-io.org for details.
2Specifications are nominal and may be subject to change.
3Turning off the system power causes the drive to perform an automatic head park operation.

Specifications WD RE3 XL333M
6 RELEASED 11/13/08 (WD CONFIDENTIAL) 2679-701179-A01
2.2.1 Physical Dimensions
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 1.52 pounds ±10% 0.69 kg ±10%

WD RE3 XL333M Specifications
2679-701179-A01 RELEASED 11/13/08 (WD CONFIDENTIAL) 7
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

Specifications WD RE3 XL333M
8 RELEASED 11/13/08 (WD CONFIDENTIAL) 2679-701179-A01
2.4 Electrical Specifications
2.4.1 Mean Current Requirements and Power Dissipation
Note: Current measurements cut off frequency at 1 kHz.
Operating Mode RMS Current1Power, Average1
12 VDC 5 VDC
Spinup (max) 2.075A 1.1A 30.4W
Spinup 1.1A 450 mA 15.5W
Read/Write 470 mA 480 mA 8.0W
Random Seek 525 mA 470 mA 8.7W
POWER MANAGEMENT COMMANDS
Operating Mode RMS Current1Power, Average1
12 VDC 5 VDC
Idle (E1H) 440 mA 390 mA 7.2W
Standby (E0H) 5 mA 160 mA 1.0W
Sleep (E6H) 5 mA 160 mA 1.0W
1All values are typical (25°C, 5.0V, and 12V input).
3.3V Serial ATA power not utilized in this product.

WD RE3 XL333M Specifications
2679-701179-A01 RELEASED 11/13/08 (WD CONFIDENTIAL) 9
2.4.2 Input Voltage Requirements
The input voltage requirements are +5.0V ± 5% and +12.0V ± 10%.
2.4.3 Ripple
2.4.4 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.
+12 VDC +5 VDC
Maximum
Frequency 200 mV (double amplitude) 0-30 MHz 100 mV (double amplitude) 0-30 MHz

Specifications WD RE3 XL333M
10 RELEASED 11/13/08 (WD CONFIDENTIAL) 2679-701179-A01
2.5 Environmental Specifications
2.5.1 Shock and Vibration
Table 2-1. Shock and Vibration
Operating Vibration
Drives are tested by applying a random excitation in each linear axis, one axis at a time. The
drive incurs no physical damage and no hard errors while subjected to continuous vibration
not exceeding the level listed in Table 2-1. Operating performance may degrade during
periods of exposure to continuous vibration.
Non-Operating Vibration
Note: This specification applies to handling and transportation of unmounted drives.
Drives are tested by applying a random excitation in each linear axis, one axis at a time. The
drive incurs no physical damage when subjected to continuous vibration not exceeding the
level listed in Table 2-1.
Packaged Shock and Vibration
The shipping packaging is designed to meet the National/International Safe Transit
Association (N/ISTA) standards for packaged products. The drive incurs no physical damage
when subjected to the N/ISTA standards.
Shock
Operating 30G, 2 ms (read/write)
65G, 2 ms (read)
Non-operating (2 ms) 250G
Note: Half-sine wave, measured without shock isolation and without non-recoverable errors.
Vibration
Operating Linear: 20-300 Hz, 0.75G (0 to peak)
Random: 0.004 g2 /Hz (10-300 Hz)
Non-operating Linear: 20-500 Hz, 4.0G (0 to peak)
Random: 0.05 g2 /Hz (10-300 Hz)
Sweep Rate 0.5 octave/minute minimum
Drive Generated Vibration
Operating 0.23 gm-mm max with the drive in an unconstrained condition
Rotational Shock Non-Operating
Amplitude 20K rad/sec2
Duration 2 ms

WD RE3 XL333M Specifications
2679-701179-A01 RELEASED 11/13/08 (WD CONFIDENTIAL) 11
2.5.2 Temperature and Humidity
2.5.3 Thermocouple Location
Figure 2-2. Drive Base Casting Thermocouple Location
Temperature & Humidity
Operating ambient temperature10°C to 60°C
Max base casting temperature265°C
S.M.A.R.T. temperature value reported within ±3°C
Humidity 5-95% RH non-condensing
37.7°C (maximum wet bulb)
Thermal Gradient 20°C/hour (maximum)
Humidity Gradient 20%/hour (maximum)
Non-operating Temperature -40°C to 70°C
Humidity 5-95% RH non-condensing
33°C (maximum wet bulb)
Thermal Gradient 30°C/hour (maximum)
Humidity Gradient 20%/hour (maximum)
1Ambient temperature is defined as the temperature of the environment immediately surrounding the drive. The
system environment must allow sufficient air flow to limit maximum surface temperatures as defined.
2See Figure 2-2 Actual drive case temperature should be below 65°C and within the 0-60°C operating ambient
temperature.
Component Location
Drive base casting #1, Figure 2-2

Specifications WD RE3 XL333M
12 RELEASED 11/13/08 (WD CONFIDENTIAL) 2679-701179-A01
2.5.4 Cooling
If forced air cooling is required, the drive must be positioned to receive airflow from one or
more fans as indicated in Figure 2-3.
Figure 2-3. Forced Airflow Direction
2.5.5 Atmospheric Pressure
2.5.6 Acoustics
2.5.7 RoHS (Restriction of Hazardous Substances)
WD complies with the Restriction of Hazardous Substances (RoHS) Directive 2002/95/EC
of the European Parliament, which is effective in the EU beginning July 1, 2006. RoHS aims to
protect human health and the environment by restricting the use of certain hazardous
substances in new equipment, and consists of restrictions on lead, mercury, cadmium, and
other substances.
The reliability, performance, and specifications of WD products are unchanged from
previously manufactured WD products, remaining among the highest in the industry.
2.6 Reliability Specifications
Altitude
Operating -1,000 feet to 10,000 feet (-305M to 3,050M)
Non-operating -1,000 feet to 40,000 feet (-305M to 12,200M)
TYPICAL SOUND POWER LEVEL1
Idle Mode (average dBA) 228
Performance Seek Mode (average dBA) 333
Quiet Seek Mode (average dBA) 329
1Measured per ECMA-74/ISO 7779.
2No audible pure tones.
3Random seek at a rate of 26 seeks per second.
Component Design Life 5 years
AFR <0.73%1
Power on Hours (POH) 87602
1MTBF steady state 1.2M hours.
224/7 application.
Above drive
Below drive
Note: Air can flow in either direction along the path shown.