Western Digital Purple PR1200M Product manual

Technical Reference Manual
WD CONFIDENTIAL
WD Purple™ PR1200M
Surveillance Hard Drives
WD60PURX
WD60PURZ
WD60EVRX

WD Purple™ PR1200M
ii RELEASED 5/4/17 (WD CONFIDENTIAL) 2679-800065-A03
© 2017 Western Digital or its affiliates
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 Purple, NoTouch, 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
2679-800065-A03-P2
Document Control Number Definition:
2679-800xxx- Axx-Px NRD
Doc Control No. Doc Revision Level Non-Released Document
Axx = Released Version
Px = Review Cycle

2679-800065-A03 RELEASED 5/4/17 (WD CONFIDENTIAL) iii
WD Purple™ PR1200M
WD Purple PR1200M
Technical Reference Manual

WD Purple™ PR1200M
iv RELEASED 5/4/17 (WD CONFIDENTIAL) 2679-800065-A03

WD Purple™ PR1200M Table of Contents
2679-800065-A03 RELEASED 5/4/17 (WD CONFIDENTIAL) v
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 Physical Specifications..................................................................................................................................................................4
2.2.1 Physical Dimensions.......................................................................................................................................................4
2.3 Mechanical Specifications............................................................................................................................................................5
2.4 Electrical Specifications................................................................................................................................................................6
2.4.1 Current Requirements and Power Dissipation.........................................................................................................6
2.4.2 Input Voltage Requirements .........................................................................................................................................6
2.4.3 Ripple.................................................................................................................................................................................6
2.4.4 Power Connectors and Cables ...................................................................................................................................6
2.5 Environmental Specifications.......................................................................................................................................................7
2.5.1 Shock and Vibration .......................................................................................................................................................7
2.5.2 Temperature and Humidity............................................................................................................................................8
2.5.3 Thermocouple Location.................................................................................................................................................9
2.5.4 Cooling........................................................................................................................................................................... 10
2.5.5 Atmospheric Pressure ................................................................................................................................................ 10
2.5.6 Acoustics ....................................................................................................................................................................... 10
2.5.7 RoHS (Restriction of Hazardous Substances) ..................................................................................................... 10
2.6 Reliability Specification and Characteristics......................................................................................................................... 11
2.7 Device Plug Connector Pin Definitions .................................................................................................................................. 11
2.8 Agency Approvals........................................................................................................................................................................ 12
2.9 Full Model Number Specification............................................................................................................................................. 12
3. PRODUCT FEATURES.............................................................................................................. 13
3.1 SATA 6 Gb/s................................................................................................................................................................................ 13
3.2 AllFrame 4K™ technology .......................................................................................................................................................... 14
3.3 IntelliSeek ...................................................................................................................................................................................... 14
3.4 Dynamic Fly Height Control ...................................................................................................................................................... 14
3.5 Perpendicular Magnetic Recording (PMR)............................................................................................................................ 14
3.6 NoTouch Ramp Load Technology ........................................................................................................................................... 15
3.7 Dual Stage Actuator Technology............................................................................................................................................. 15
3.8 Advanced Format (AF) ............................................................................................................................................................... 15
3.9 Native Command Queuing (NCQ).......................................................................................................................................... 15
3.10 Preemptive Wear Leveling (PWL) ........................................................................................................................................... 15
3.11 Femto Slider.................................................................................................................................................................................. 16
3.12 S.M.A.R.T. Command Transport (SCT).................................................................................................................................. 16
3.12.1 Write Same ................................................................................................................................................................... 16
3.12.2 Temperature Reporting............................................................................................................................................... 16
3.13 World Wide Name (WWN) ...................................................................................................................................................... 17
3.14 Reliability Features Set............................................................................................................................................................... 17
3.14.1 Data Lifeguard™ ........................................................................................................................................................... 17
3.14.2 Thermal Management.................................................................................................................................................. 17
3.14.3 Internal Environmental Protection System.............................................................................................................. 18
3.14.4 Recoverable Errors...................................................................................................................................................... 18
3.14.5 Unrecoverable Errors .................................................................................................................................................. 18
3.14.6 Self Test ......................................................................................................................................................................... 18
3.14.7 ATA Error Logging....................................................................................................................................................... 18
3.14.8 Defect Management.................................................................................................................................................... 19
3.15 Automatic Defect Retirement.................................................................................................................................................... 19
3.15.1 Error Recovery Process.............................................................................................................................................. 19
3.16 Hot Plug Support......................................................................................................................................................................... 20

Table of Contents WD Purple™ PR1200M
vi RELEASED 5/4/17 (WD CONFIDENTIAL) 2679-800065-A03
3.17 Active LED Status........................................................................................................................................................................ 20
3.18 Fluid Dynamic Bearings (FDB) ................................................................................................................................................. 20
3.19 Staggered Spinup and Activity Indication (SATA Power Pin 11) .................................................................................... 20
3.19.1 Staggered Spinup........................................................................................................................................................ 21
3.19.2 Activity Indication ......................................................................................................................................................... 21
3.20 CacheFlow™ ................................................................................................................................................................................. 21
3.20.1 Write Cache.................................................................................................................................................................. 21
3.20.2 Read Cache .................................................................................................................................................................. 22
3.21 48-bit Logical Block Addressing (LBA) ................................................................................................................................. 22
3.22 Power Management .................................................................................................................................................................... 22
3.23 Self-Monitoring, Analysis, and Reporting Technology (S.M.A.R.T.)................................................................................. 22
3.24 Security Mode .............................................................................................................................................................................. 23
3.24.1 Master and User Passwords ..................................................................................................................................... 23
3.24.2 Security Levels.............................................................................................................................................................. 23
4. ATA COMMAND SET ............................................................................................................. 24
4.1 Host Interface Commands......................................................................................................................................................... 24
4.1.1 ATA-8 Commands....................................................................................................................................................... 24
4.1.2 SATA Commands ........................................................................................................................................................ 25
4.1.3 Obsolete Commands.................................................................................................................................................. 25
4.1.4 SCT Commands .......................................................................................................................................................... 26
4.2 S.M.A.R.T. (B0h).......................................................................................................................................................................... 26
4.2.1 Read Attribute Values Sub-Command ................................................................................................................... 26
4.2.2 Supported Attributes................................................................................................................................................... 28
4.2.3 Read Log Sector.......................................................................................................................................................... 29
4.3 Identify Device (ECh).................................................................................................................................................................. 30
4.4 Set Features (EFh) ..................................................................................................................................................................... 37
5. INSTALLATION AND SETUP PROCEDURES............................................................................. 38
5.1 Unpacking...................................................................................................................................................................................... 38
5.1.1 Handling Precautions.................................................................................................................................................. 38
5.1.2 Inspection of Shipping Container ............................................................................................................................ 38
5.1.3 Removal From Shipping Container.......................................................................................................................... 38
5.1.4 Removal From Static Shielding Bag........................................................................................................................ 39
5.1.5 Moving Precautions..................................................................................................................................................... 39
5.2 Mounting........................................................................................................................................................................................ 39
5.2.1 Mounting Restrictions................................................................................................................................................. 39
5.2.2 Orientation..................................................................................................................................................................... 39
5.2.3 Screw Size Limitations ............................................................................................................................................... 39
5.2.4 Grounding...................................................................................................................................................................... 40
5.3 Hard Drive Installation................................................................................................................................................................. 40
5.3.1 Jumper Settings............................................................................................................................................................ 40
5.3.2 Attach the Power Supply Cable............................................................................................................................... 41
5.3.3 Attach SATA Interface Cable.................................................................................................................................... 42
5.4 Serial ATA Latching Connector................................................................................................................................................ 42
6. MAINTENANCE ........................................................................................................................ 43
7. TECHNICAL SUPPORT............................................................................................................. 44
7.1 WD Online Services ................................................................................................................................................................... 44
8. GLOSSARY .............................................................................................................................. 45

WD Purple™ PR1200M List of Figures
2679-800065-A03 RELEASED 5/4/17 (WD CONFIDENTIAL) vii
List of Figures
Figure 2-1 Mounting Dimensions .................................................................................................................. 5
Figure 2-2 Drive Base Casting Thermocouple Location............................................................................. 9
Figure 2-3 Forced Airflow Direction........................................................................................................... 10
Figure 2-4 Standard Factory Connectors ...................................................................................................11
Figure 5-1 Jumper Settings ..........................................................................................................................41
Figure 5-2 Connector Locations................................................................................................................. 42
Figure 5-3 SATA Interface Cable ................................................................................................................ 42

List of Figures WD Purple™ PR1200M
viii RELEASED 5/4/17 (WD CONFIDENTIAL) 2679-800065-A03

WD Purple™ PR1200M List of Tables
2679-800065-A03 RELEASED 5/4/17 (WD CONFIDENTIAL) ix
List of Tables
Table 2-1 Shock and Vibration...............................................................................................................................................7
Table 2-2 Device Pin Connector Pin Definitions............................................................................................................. 11
Table 2-3 Full Model Number Description........................................................................................................................ 12
Table 4-1 ATA-8 Command Opcodes .............................................................................................................................. 24
Table 4-2 SATA Command Opcodes................................................................................................................................ 25
Table 4-3 Obsolete Command Opcodes ......................................................................................................................... 25
Table 4-4 SCT Action Codes .............................................................................................................................................. 26
Table 4-5 Definitions for the 512 Bytes. ........................................................................................................................... 26
Table 4-6 Log Address Definition....................................................................................................................................... 29
Table 4-7 Identify Device Command.................................................................................................................................. 30

List of Tables WD Purple™ PR1200M
x RELEASED 5/4/17 (WD CONFIDENTIAL) 2679-800065-A03

2679-800065-A03 RELEASED 5/4/17 (WD CONFIDENTIAL) 1
WD Purple™ PR1200M Description and Features
1.0 DESCRIPTION AND FEATURES
1.1 General Description
WD Purple Surveillance Storage is built for 24/7 always-on surveillance in high
definition security systems that utilize higher hard drive bay counts and up to 64
cameras. Exclusive AllFrame 4K™ technology works with ATA streaming to reduce
error pixilation and video interruptions that occur when desktop hard drives are
incorrectly used as storage in security systems.
1.2 Product Features
Serial ATA (SATA) — Serial ATA (SATA) is the industry standard 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.
AllFrame 4K™ Technology — All WD Purple™ drives are equipped with AllFrame
4K™ technology, which improves ATA streaming to help reduce frame loss, improve
overall video playback, and increase the number of hard drive bays supported within
a NVR. Help make your surveillance solution future-ready knowing that WD Purple™
drives are ready for ultra high definition cameras.
IntelliSeek™ —Calculates optimum seek speeds to lower power consumption, noise,
and vibration.
Dynamic Fly Height Control —Designed to compensate for head/media separation
changes due to temperature and altitude. This feature adds video quality margins
across temperature and altitude changes.
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.
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.
Dual Stage Actuator Technology —A head positioning system with dual-stage
actuators that improves positioning accuracy over the data track(s). The primary
stage provides course displacement; the secondary stage uses piezoelectric motion
to fine tune the head positioning to a higher degree of precision.
Advanced Format (AF) — Technology adopted by WD and other drive manufacturers
as one of multiple ways to continue growing hard drive capacities. AF is a more
efficient media format that enables increased areal densities.
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 Queuing (NCQ), which is supported by these hard drives.
Preemptive 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

Description and Features WD Purple™ PR1200M
2 RELEASED 5/4/17 (WD CONFIDENTIAL) 2679-800065-A03
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 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 — A feature that allows the system to control whether the drive
will spin up immediately or wait until the interface is fully ready (this feature may not
be available in all configurations).
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.

2679-800065-A03 RELEASED 5/4/17 (WD CONFIDENTIAL) 3
WD Purple™ PR1200M Description and Features
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.

Specifications WD Purple™ PR1200M
4 RELEASED 5/4/17 (WD CONFIDENTIAL) 2679-800065-A03
2.0 SPECIFICATIONS
2.1 Performance Specifications
2.2 Physical Specifications
Specifications represented are of a typical production drive and may be subject to
change or variation without notice.
2.2.1 Physical Dimensions
Rotational Speed 5400 RPM class
Data Transfer Rate1
- Buffer to Host
- Host to/from Disk (typical)
6 Gb/s maximum
175 MB/s sustained (WD60PURX/
WD60PURZ/WD60EVRX)
Buffer Size 64 MB
Error Rate - Unrecoverable <1 in 1014 bits read
Spindle Start Time
- From Power-on to Drive Ready
- From Power-on to Rotational Speed
14s average
9s average
Spindle Stop Time <15s average
Load/Unload Cycles (controlled unload at ambient
condition)
300,000
1 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.
Physical Specifications WD60PURX/WD60PURZ/WD60EVRX
Capacity16TB
Interface SATA 6 Gb/s
Number of Disks 5
Data Surfaces 10
Number of Heads 10
Physical bytes per sector 4096
Host bytes per sector 512
User Sectors per Drive 11,721,045,168
Servo Type Embedded
Recording Method LDPC Target
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
document. Visit www.sata-io.org for details.
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 1.58 pounds ±10% 0.72 kg ±10%

2679-800065-A03 RELEASED 5/4/17 (WD CONFIDENTIAL) 5
WD Purple™ PR1200M Specifications
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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Specifications WD Purple™ PR1200M
6 RELEASED 5/4/17 (WD CONFIDENTIAL) 2679-800065-A03
2.4 Electrical Specifications
2.4.1 Current Requirements and Power Dissipation
All values are typical (25°C, 5.0V, and 12V input). 3.3V Serial ATA power not utilized in
this product.
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 gauge.
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.
Operating Mode Mean Current1Power, Average1
12 VDC 5 VDC
Spinup (max) 1.75A — 24.8W
Read/Write 320 mA 300 mA 5.3W
Seek 340 mA 280 mA 5.5W
POWER MANAGEMENT COMMANDS
Operating Mode Mean Current1Power, Average1
12 VDC 5 VDC
Idle2 320 mA 210 mA 4.9W
Standby/Sleep 7 mA 70 mA 0.4W
+12 VDC +5 VDC
Maximum
Frequency
200 mV (double amplitude)
0-30 MHz
100 mV (double amplitude)
0-30 MHz

2679-800065-A03 RELEASED 5/4/17 (WD CONFIDENTIAL) 7
WD Purple™ PR1200M Specifications
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.
Rotational Shock Non-Operating
Amplitude 20K rad/sec2
Duration 2 ms
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
Rotational Vibration
12.5 rad/sec2based on the following PSD profile maintaining < 20% degradation:
Frequency (Hz) 20 200 300 900 1400 1500
(Rad/sec2)2/Hz 0.035 0.035 0.2 0.2 0.002 0.002
Drive Generated Vibration
Operating 0.2 gm-mm average with the drive in an unconstrained condition

Specifications WD Purple™ PR1200M
8 RELEASED 5/4/17 (WD CONFIDENTIAL) 2679-800065-A03
2.5.2 Temperature and Humidity
The system environment must allow sufficient air flow to limit maximum surface
temperatures as defined. MTBF can be affected by workload and operating
temperature. See Section 2.6 on page 11 for further details.
Operation
Min-Max Base Casting
Temperature1
0C to 65C on the base casting (see Figure 2-2 below)
Humidity 5-95% RH non-condensing
37.7C (maximum wet bulb)
Thermal Gradient 20C/hour (maximum)
Humidity Gradient 20%/hour (maximum)
Non-Operation
Non-operating Temperature -40C to 70C on the base casting (see Figure 2-2 below)
Humidity 5-95% RH non-condensing
35C (maximum wet bulb)
Thermal Gradient 30C/hour (maximum)
Humidity Gradient 20%/hour (maximum)
1The system environment must allow sufficient air flow to limit maximum base casting temperatures as
defined in Figure 2-2 below.

2679-800065-A03 RELEASED 5/4/17 (WD CONFIDENTIAL) 9
WD Purple™ PR1200M Specifications
2.5.3 Thermocouple Location
Figure 2-2. Drive Base Casting Thermocouple Location
Component Location
Drive base casting #1, Figure 2-2
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Specifications WD Purple™ PR1200M
10 RELEASED 5/4/17 (WD CONFIDENTIAL) 2679-800065-A03
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 2011/
65/EU of the European Parliament, which is effective in the EU beginning July 8, 2011.
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.
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 LEVEL
Measured per ECMA-74/ISO 7779
Idle Mode (average dBA, no audible pure tones) 25
Seek Mode (average dBA) 26
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