Western Digital WD Purple Reference Manual

TECHNICAL REFERENCE MANUAL FOR THE FOLLOWING WD PURPLE™ HARD DRIVE OEM MODELS ONLY

WD21HKVS-78AUUYz

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, IntelliSeek, 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 5601 Great Oaks Parkway San Jose, CA 95119

2679-810067-A00

Document Control Number Definition:

2679-8xxxxx-Axx Axx-Px NRD

Doc Control No. Doc Revision Level Non-Released Document

Axx = Released Version Px = Review Cycle

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TABLE OF CONTENTS

1. DESCRIPTION AND FEATURES .............................................................................................8

1.1 General Description ........................................................................................................................ 8

1.2 Product Features ............................................................................................................................. 8

2. SPECIFICATIONS ............................................................................................................... 11

2.1 Performance Specifications............................................................................................................11

2.2 Physical Specifications....................................................................................................................11

2.2.1 Physical Dimensions............................................................................................................... 12

2.3 Mechanical Specifications ............................................................................................................. 12

2.4 Electrical Specifications................................................................................................................ 13

2.4.1 Current Requirements and Power Dissipation.................................................................... 13

2.4.2 Input Voltage Requirements ................................................................................................ 13

2.4.3 Voltage Ripple....................................................................................................................... 13

2.5 Environmental Specifications....................................................................................................... 14

2.5.1 Shock and Vibration .............................................................................................................. 14

2.5.2 Temperature and Humidity .................................................................................................. 15

2.5.3 Thermocouple Location ....................................................................................................... 15

2.5.4 Cooling................................................................................................................................... 16

2.5.5 Atmospheric Pressure........................................................................................................... 16

2.5.6 Atmospheric Condition ........................................................................................................ 16

2.5.7 Acoustics................................................................................................................................ 17

2.5.8 RoHS (Restriction of Hazardous Substances)..................................................................... 17

2.6 Reliability Specification and Characteristics................................................................................ 17

2.7 Connectors and Cables ................................................................................................................. 17

2.7.1 Serial ATA Connectors........................................................................................................... 17

2.7.2 Cabling Requirements for Serial ATA .................................................................................. 17

2.8 Agency Approvals......................................................................................................................... 18

2.9 Full Model Number Specification .................................................................................................. 18

3. PRODUCT FEATURES.........................................................................................................19

3.1 SATA 6 Gb/s ................................................................................................................................. 20

3.2 AllFrame 4K™ Technology ........................................................................................................... 20

3.3 Premium Protection ...................................................................................................................... 20

3.4 IntelliSeek ....................................................................................................................................... 20

3.5 Dynamic Fly Height Control ......................................................................................................... 20

3.6 NoTouch Ramp Load Technology ................................................................................................ 21

3.7 Dual Actuator Technology............................................................................................................. 21

3.8 Advanced Format (AF) ................................................................................................................... 21

3.9 Native Command Queuing (NCQ) ................................................................................................ 21

3.10 Pre-emptive Wear Leveling (PWL) ............................................................................................... 21

3.11 S.M.A.R.T. Command Transport (SCT).......................................................................................... 21

3.11.1 Write Same ........................................................................................................................... 22

3.11.2 Temperature Reporting ...................................................................................................... 22

3.12 World Wide Name (WWN) .......................................................................................................... 22

3.13 Reliability Features Set ................................................................................................................. 22

3.13.1 Data Lifeguard™ ...................................................................................................................23

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Table of Contents

3.13.2 Thermal Management..........................................................................................................23

3.13.3 Internal Environmental Protection System........................................................................24

3.13.4 Recoverable Errors .............................................................................................................24

3.13.5 Self Test ................................................................................................................................24

3.13.6 ATA Error Logging ...............................................................................................................24

3.13.7 Defect Management ............................................................................................................24

3.14 Automatic Defect Retirement ...................................................................................................... 25

3.14.1 Error Recovery Process....................................................................................................... 25

3.15 Hot Plug Support........................................................................................................................... 26

3.16 Active LED Status .......................................................................................................................... 26

3.17 Fluid Dynamic Bearings (FDB) ...................................................................................................... 26

3.18 Staggered Spinup and Activity Indication (SATA Power Pin 11) ............................................... 26

3.19 Power Management .......................................................................................................................27

3.20 Self-Monitoring, Analysis, and Reporting Technology (S.M.A.R.T.)...........................................27

3.21 Security Mode .................................................................................................................................27

3.21.1 Master and User Passwords.................................................................................................27

3.21.2 Security Levels .................................................................................................................... 28

4. ATA COMMAND SET .......................................................................................................29

4.1 Host Interface Commands............................................................................................................ 29

4.1.1 ATA Commands Set (ACS).................................................................................................... 29

4.1.2 SCT Commands..................................................................................................................... 30

4.2 S.M.A.R.T. (B0h) ............................................................................................................................. 30

4.2.1 Read Data Sub-Command..................................................................................................... 31

4.2.2 Supported Attributes............................................................................................................32

4.2.3 Read Log Sector....................................................................................................................33

4.3 Identify Device (ECh) ....................................................................................................................34

4.4 Set Features (EFh) ......................................................................................................................... 41

5. INSTALLATION AND SETUP PROCEDURES ........................................................................... 42

5.1 Unpacking .......................................................................................................................................42

5.1.1 Handling Precautions .............................................................................................................42

5.1.2 Inspection of Shipping Container ........................................................................................42

5.1.3 Removal From Shipping Container ......................................................................................42

5.1.4 Removal From Static Shielding Bag.....................................................................................43

5.1.5 Moving Precautions ...............................................................................................................43

5.2 Mounting .........................................................................................................................................43

5.2.1 Mounting Restrictions............................................................................................................43

5.2.2 Orientation.............................................................................................................................43

5.2.3 Screw Size Limitations ..........................................................................................................43

5.2.4 Grounding..............................................................................................................................44

5.3 Hard Drive Installation....................................................................................................................44

5.3.1 Jumper Settings .....................................................................................................................44

5.3.2 Attach the Power Supply Cable ..........................................................................................45

5.3.3 Attach SATA Interface Cable................................................................................................45

5.4 Serial ATA Latching Connector.....................................................................................................45

6. MAINTENANCE ................................................................................................................ 46

ECHNICAL SUPPORT ...................................................................................................... 47

7. T

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Table of Contents

7.1 WD Online Services........................................................................................................................47

8. THIRD-PARTY NOTICES.................................................................................................... 48

8.1 LZHUF.C.......................................................................................................................................... 48

8.2 EfAesLib.......................................................................................................................................... 48

8.3 A portable, fast, and free implementation of the MD5 Message-Digest Algorithm (RFC 1321)... 52

8.4 Embedded Template Library ....................................................................................................... 52

8.5 uTensor............................................................................................................................................53

9. GLOSSARY ...................................................................................................................... 57

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List of Figures

LIST OF FIGURES

Figure 2-1 Mounting Dimensions ................................................................................................................. 12

Figure 2-2 Drive Base Casting Thermocouple Location............................................................................ 15

Figure 2-3 Forced Airflow Direction............................................................................................................ 16

Figure 5-1 Jumper Settings...........................................................................................................................44

Figure 5-2 Connector Locations..................................................................................................................45

Figure 5-3 SATA Interface Cable .................................................................................................................45

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List of Tables

LIST OF TABLES

Table 2-1 Performance Specifications..........................................................................................................11

Table 2-2 Physical Specifications, ................................................................................................................11

Table 2-3 Physical Dimensions..................................................................................................................... 12

Table 2-4 Current Requirements and Power Dissipation.......................................................................... 13

Table 2-5 Voltage Ripple ............................................................................................................................. 13

Table 2-6 Shock and Vibration .................................................................................................................... 14

Table 2-7 Temperature and Humidity......................................................................................................... 15

Table 2-8 Thermocouple Location.............................................................................................................. 15

Table 2-9 Atmospheric Pressure ................................................................................................................. 16

Table 2-10 Acoustics..................................................................................................................................... 17

Table 2-11 Reliability Specification and Characteristics ............................................................................ 17

Table 2-12 Full Model Number Description ................................................................................................18

Table 4-1 ATA-8 Command Opcodes......................................................................................................... 29

Table 4-2 SCT Action Codes....................................................................................................................... 30

Table 4-3 Definitions for the 512 Bytes ....................................................................................................... 31

Table 4-4 Supported Attributes ..................................................................................................................32

Table 4-5 Log Address Definition................................................................................................................33

Table 4-6 Identify Device Command ..........................................................................................................34

Table 4-7 Set Features (EFh) ........................................................................................................................ 41

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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 highdefinition security systems that utilize higher hard drive bay counts. Exclusive AllFrame 4K™ technology works with ATA streaming to reduce error pixelation 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 offers 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.

 Premium Protection — Designed with tarnish-resistant components, this WD

Purple drive offers premium protection in harsh environments where surveillance systems may be installed.

 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.

 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 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 Western Digital 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.

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Description and Features

 Pre-emptive Wear Leveling (PWL) — This Western Digital 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.

 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. Western Digital’s OUI is 0014EEh.

 Reliability Features Set-Data Lifeguard™ — Representing Western Digital's

ongoing commitment to data protection, Data Lifeguard includes features that enhance the drives 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. 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 (available for specific OEM configurations).

 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.

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Description and Features

 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.

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2.0 SPECIFICATIONS

2.1 Performance Specifications

Table 2-1. Performance Specifications

Performance Class 5400 RPM Class

Data Transfer Rate

- Buffer to Host

Buffer Size 256 MB

Error Rate - Unrecoverable <1 in 10

Spindle Start Time

- From Power-on to Drive Ready

Spindle Stop Time <15s average

Load/Unload Cycles

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.

Defined as the time from power-on to the setting of Drive Ready.

Controlled unload at ambient condition.

Specifications

6 Gb/s maximum

bits read

12s average

300,000

2.2 Physical Specifications

Table 2-2. Physical Specifications

Model Number WD21HKVS

Capacity

Interface SATA 6 Gb/s

Number of Disks 1

Data Surfaces 2

Number of Heads 2

Physical bytes per sector 4096

Host bytes per sector 512

User Sectors per Drive 3,907,029,168

Servo Type Embedded

Recording Method LDPC Target

Recording Technology SMR

1,2

2TB

Specifications represented are of a typical production drive and may be subject to change or variation without notice.

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.

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Specifications

2.2.1 Physical Dimensions

Table 2-3. Physical Dimensions

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 1.26 pounds ±10% 0.57 kg ±10%

2.3 Mechanical Specifications

Figure 2-1 shows the mounting dimensions and locations of the screw holes for the drive.

Note: Unless otherwise specified, all measurements are in millimeters.

Figure 2-1. Mounting Dimensions

English Metric

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Specifications

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.

Table 2-4. Current Requirements and Power Dissipation

Operating Mode

Spinup (max) 1.75 A – – Read/Write (avg) 260 mA 370 mA 5.0 W Idle (avg) 250 mA 295 mA 4.5 W Standby (avg) 10 mA 55 mA 0.4 W Sleep (avg) 10 mA 55 mA 0.4 W

12 VDC 5 VDC

Mean Current

Power, Average

2.4.2 Input Voltage Requirements

The input voltage requirements are +5.0V ± 5% and +12.0V ± 10%.

2.4.3 Voltage Ripple

Table 2-5. Voltage Ripple

Maximum (mV pp) MHz

+5V DC 100 0-30

+12V DC 200 0-30

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Specifications

2.5 Environmental Specifications

2.5.1 Shock and Vibration

Table 2-6. Shock and Vibration

Shock

Operating 70G, 2 ms (read/write) 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: 0.008 g

Non-operating Linear: 20-500 Hz, 4.0G (0 to peak)

Random: 0.05 g

Sweep Rate 0.5 octave/minute minimum

Rotational Vibration

12.5 rad/sec Frequency (Hz) 20 200 300 900 1400 1500

(Rad/sec

Rotational Shock Non-Operating

Amplitude 20K rad/sec Duration 2 ms

Rotational vibration spec is applicable to 4TB and 6TB only.

based on the following PSD profile maintaining < 20% degration:

2)2

0.035 0.035 0.2 0.2 0.002 0.002

/Hz

/Hz (10-300 Hz)

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 2-6. 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 2-6.

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.

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Specifications

2.5.2 Temperature and Humidity

The system environment must allow sufficient air flow to limit maximum surface temperatures as defined. AFR can be affected by workload and operating temperature. See Section 2.6 Reliability Specification and Characteristics on page 17 for further details.

Table 2-7. Temperature and Humidity

Temperature & Humidity

Min-Max Base Casting Temperature

Humidity 5-95% RH non-condensing

Thermal Gradient 20°C/hour (maximum)

Humidity Gradient 20%/hour (maximum)

Temperature -40°C to 70°C on the base casting (-40°F to 158°F)

Humidity 5-95% RH non-condensing

Thermal Gradient 30°C/hour (maximum)

Humidity Gradient 20%/hour (maximum)

Operating at elevated base casting temperatures will result in a higher AFR.

Operation

0°C to 65°C (32°F to 149°F)

37.7°C (maximum wet bulb)

Non-Operation

40°C (maximum wet bulb)

2.5.3 Thermocouple Location

Table 2-8. Thermocouple Location

Component Location

Drive base casting #1, Figure 2-2

Figure 2-2. Drive Base Casting Thermocouple Location

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Specifications

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

Table 2-9. Atmospheric Pressure

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)

2.5.6 Atmospheric Condition

Environments that contain elevated levels of corrosives (e.g., hydrogen sulfide, sulfur oxides, or hydrochloric acid, sulfurous gases, chlorine and nitric oxide) should be avoided and ideally kept below G2 severity level defined in ISA–71.04–1985. Care must be taken to avoid using any compound/material in a way that creates an elevated level of corrosive materials in the atmosphere surrounding the disk drive. Vulcanized rubber is an example of a material which may contain corrosive compound/materials.

Care must also be taken to avoid the use of any organometallic (e.g., organosilicones or organotins) compound/material in a way that creates elevated vapor levels of these compounds/materials in the atmosphere surrounding the disk drive.

Siliconebased Thermal Interface Materials (TIM), silicone-based tapes, caulking/RTV pastes, silicone rubbers and silicone oil lubricants are examples of materials which may create elevated vapor levels of organometallic compound/materials.

Use of the disk drive in these abnormal or other chemically-challenging environments is not recommended and increases the risk for failure. If any of these materials are considered in system design, it is recommended to consult with Western Digital Corporation.

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2.5.7 Acoustics

Table 2-10. Acoustics

Specifications

TYPICAL SOUND POWER LEVEL

Idle Mode (average dBA) Seek Mode (average dBA) 27

Measured per ECMA-74/ISO 7779.

No audible pure tones.

2.5.8 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.

2.6 Reliability Specification and Characteristics

The Mean Time between Failure (MTBF) calculations assumes operation at nominal voltages, a base casting temperature of 40°C, and the workload usage of a typical surveillance environment. Workload is defined as the number of bytes transferred by the user to/from the drive. If the system(s) that the drive is installed in are not capable of meeting the characteristics listed below, please use a WD drive that matches your system(s)' capability. Operating drives outside any of the reliability characteristics below will result in a higher AFR.

Table 2-11. Reliability Specification and Characteristics

MTBF 1,000,000

Reliability Characteristics

Base Casting Temperature 40°C

Annual Power on Hours (POH) <=8760

Total Workload over the Limited Warranty Period

Annualized Workload Rate = TB transferred x (8760 / recorded power-on hours)

2.7 Connectors and Cables

2.7.1 Serial ATA Connectors

For information on SATA data connectors, including the pin definitions of the SATA connectors and the corresponding signal names and signal functions, refer to the latest SATA specification available for download at www.serialata.org.

2.7.2 Cabling Requirements for Serial ATA

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 specification for cable specifications. The cable's maximum length is one meter.

Reliability Specification

<=180TB/Yr

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2.8 Agency Approvals

PR2000S-1 Regulatory Number (R/N): 810011

These drives meet the standards of the following regulatory agencies:

 Federal Communication Commission: Verified to comply with FCC Rules for

Radiated and Conducted Emission, Part 15, Subpart B, for Class B Equipment.

 Underwriters Laboratories: Bi-National UL Standard CAN/CSA-C22.2 No. 60950/

UL 60950-1. Standard for Safety of Information Technology Equipment, including Electrical Business Equipment.

 TUV: IEC 60950-1 per EN 60950-1, Standard for Safety of Information Technology

Equipment, including Electrical Business Equipment.

 CE Compliance for Europe Countries and Morocco: Verified to comply with

EN55032:2015 for RF Emissions and EN55024:1998, A1:2001 + A2:2003, EN61000-32:2000, EN61000-3-3:1995 + A1:2001 for Generic Immunity as applicable.

 RCM Compliance for Australia and New Zealand: Verified to comply with AS/

NZ3548 for RF Emissions as required by the Australian Communications Authority.

 Korean KC Mark: Registered as a Class-B product with the South Korean Ministry

of Information and Communication.

Specifications

 Taiwan BSMI ROHS Compliance: Certified as a Class-B product with the Bureau of

Standards Metrology and Inspection (BSMI ROHS).

2.9 Full Model Number Specification

Table 2-12 below provides a summary specification of the model number suffix for this product platform.

Table 2-12. Full Model Number Description

Model Number Format ID Product Brand Description

WD21HKVS-78AUUYz AUU WD Purple PR2000S-1 256MB SATA 6 Gb/s 2TB SRV

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