Western Digital Scorpio ML160M Product manual

Technical Reference Manual
WD CONFIDENTIAL
WD3200BEVE
WD2500BEVE
WD1600BEVE
WD1200BEVE
WD800BEVE
WD Scorpio®ML160M
EIDE Hard Drives

© 2009 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 Scorpio are registered trademarks in the U.S. and other
countries; and 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, California 92630
U.S.A.
2679-701205-A00
Document Control Number Definition:
2679-001xxx- 0xx-Px NRD
Doc Control No. Doc Revision Level
(WD Caviar Drives) Non-Released Document
Oxx = Released Version
Px = Review Cycle
WD CONFIDENTIAL

2679-701205-A00 RELEASED 1/16/09 (WD CONFIDENTIAL)
WD Scorpio ML160M
WD800BEVE
WD1200BEVE
WD1600BEVE
WD2500BEVE
WD3200BEVE
Technical Reference Manual

RELEASED 1/16/09 (WD CONFIDENTIAL) 2679-701205-A00

WD Scorpio ML160M Table of Contents
2679-701205-A00 RELEASED 1/16/09 (WD CONFIDENTIAL) i
TABLE OF CONTENTS
1. DESCRIPTION AND FEATURES ................................................................................................. 1
1.1 General Description....................................................................................................................................................................... 1
1.2 Product Features ............................................................................................................................................................................ 1
2. SPECIFICATIONS....................................................................................................................... 3
2.1 Performance Specifications ......................................................................................................................................................... 3
2.2 Physical Specifications.................................................................................................................................................................. 4
2.2.1 Physical Dimensions ...................................................................................................................................................... 5
2.3 Mechanical Specifications............................................................................................................................................................ 6
2.4 Electrical Specifications................................................................................................................................................................ 7
2.4.1 Current Requirements and Power Dissipation ........................................................................................................ 7
2.4.2 Input Voltage Requirements......................................................................................................................................... 8
2.4.3 Ripple................................................................................................................................................................................. 8
2.5 Environmental Specifications....................................................................................................................................................... 8
2.5.1 Shock and Vibration ....................................................................................................................................................... 8
2.5.2 Temperature and Humidity ........................................................................................................................................... 9
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 Specifications .............................................................................................................................................................10
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 Perpendicular Magnetic Recording (PMR).............................................................................................................................14
3.2 Reduced Power Spinup (RPS) .................................................................................................................................................15
3.3 System-on-Chip (SOC)..............................................................................................................................................................15
3.4 S.M.A.R.T. Command Transport (SCT)...................................................................................................................................16
3.4.1 Write Same ....................................................................................................................................................................16
3.4.2 Read/Write Long ..........................................................................................................................................................16
3.4.3 Temperature Reporting................................................................................................................................................16
3.5 Reliability Features Set................................................................................................................................................................17
3.5.1 Data Lifeguard™ ............................................................................................................................................................17
3.5.2 Thermal Management ..................................................................................................................................................17
3.5.3 Internal Environmental Protection System ..............................................................................................................18
3.5.4 Recoverable Errors.......................................................................................................................................................18
3.5.5 Unrecoverable Errors ...................................................................................................................................................18
3.5.6 Self Test ..........................................................................................................................................................................18
3.5.7 ATA Error Logging........................................................................................................................................................18
3.5.8 Defect Management.....................................................................................................................................................18
3.5.9 Automatic Defect Retirement.....................................................................................................................................19
3.5.10 Error Recovery Process...............................................................................................................................................19
3.6 Hot Plug Support..........................................................................................................................................................................20
3.6.1 Hot Plug Technical Issues ..........................................................................................................................................20
3.7 Active LED Status ........................................................................................................................................................................22
3.8 Fluid Dynamic Bearings (FDB)..................................................................................................................................................23
3.9 CacheFlow™ ..................................................................................................................................................................................23
3.9.1 Write Cache...................................................................................................................................................................24
3.9.2 Read Cache ...................................................................................................................................................................24
3.9.3 48-bit Logical Block Addressing (LBA) ..................................................................................................................24
3.10 Power Management .....................................................................................................................................................................24
3.11 Self-Monitoring, Analysis, and Reporting Technology (S.M.A.R.T.)..................................................................................24
3.12 Security Mode ...............................................................................................................................................................................25
3.12.1 Master and User Passwords ......................................................................................................................................25

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Table of Contents WD Scorpio ML160M
3.12.2 Security Levels ..............................................................................................................................................................25
3.13 Automatic Acoustic Management (AAM)................................................................................................................................25
4. AT COMMAND SET ................................................................................................................ 26
4.1 Host Interface Commands .........................................................................................................................................................26
4.1.1 ATA-7/ATA-8 Commands ..........................................................................................................................................26
4.1.2 Obsolete Commands...................................................................................................................................................27
4.2 S.M.A.R.T. (B0h)...........................................................................................................................................................................28
4.2.1 Read Attribute Values Sub-Command ....................................................................................................................28
4.2.2 Supported Attributes ...................................................................................................................................................30
4.2.3 Read Log Sector...........................................................................................................................................................31
4.2.4 Offline Data Collection ................................................................................................................................................31
4.3 Identify Device (ECh)...................................................................................................................................................................32
4.4 Set Features (EFh) ......................................................................................................................................................................38
5. INSTALLATION AND SETUP PROCEDURES............................................................................. 39
5.1 Unpacking ......................................................................................................................................................................................39
5.1.1 Handling Precautions...................................................................................................................................................39
5.1.2 Inspection of Shipping Container .............................................................................................................................39
5.1.3 Removal From Shipping Container...........................................................................................................................39
5.1.4 Removal From Static Shielding Bag.........................................................................................................................40
5.1.5 Moving Precautions......................................................................................................................................................40
5.2 Mounting Restrictions..................................................................................................................................................................40
5.2.1 Orientation......................................................................................................................................................................40
5.2.2 Screw Size Limitations ................................................................................................................................................40
5.2.3 Grounding.......................................................................................................................................................................41
5.3 Jumper Settings ............................................................................................................................................................................42
6. MAINTENANCE ........................................................................................................................ 43
7. TECHNICAL SUPPORT............................................................................................................. 44
7.1 WD Online Services ....................................................................................................................................................................44
8. GLOSSARY .............................................................................................................................. 45

2679-701205-A00 RELEASED 1/16/09 (WD CONFIDENTIAL) iii
WD Scorpio ML160M List of Figures
LIST OF FIGURES
Figure 2-1 Mounting Dimensions...........................................................................................................................................6
Figure 2-2 Typical +5V Current Draw During Spinup .....................................................................................................7
Figure 2-3 Drive Base Casting Thermocouple Location ..................................................................................................9
Figure 2-4 Forced Airflow Direction ................................................................................................................................... 10
Figure 2-5 Standard Factory Connectors ......................................................................................................................... 11
Figure 3-1 RPS Spinup Profile ............................................................................................................................................ 15
Figure 5-1 Drive Handling Precautions.............................................................................................................................. 39
Figure 5-2 Hard Drive Removal From Static Shielding Bag ......................................................................................... 40
Figure 5-3 Grounding Diagram ........................................................................................................................................... 41
Figure 5-4 Jumper Settings for WD Scorpio Hard Drives ............................................................................................ 42

iv RELEASED 1/16/09 (WD CONFIDENTIAL) 2679-701205-A00
List of Tables WD Scorpio ML160M
LIST OF TABLES
Table 2-1 Shock and Vibration ...............................................................................................................................................8
Table 2-2 Device Pin Connector Pin Definitions............................................................................................................. 11
Table 2-3 Full Model Number Description........................................................................................................................ 12
Table 4-1 ATA-7/ATA-8 Command Opcodes................................................................................................................. 26
Table 4-2 Obsolete Command Opcodes .......................................................................................................................... 27
Table 4-3 Definitions for the 512 Bytes. ........................................................................................................................... 28
Table 4-4 Defined Error Logging Sectors......................................................................................................................... 31
Table 4-5 Identify Device Command.................................................................................................................................. 32

WD Scorpio ML160M Description and Features
2679-701205-A00 RELEASED 1/16/09 (WD CONFIDENTIAL) 1
1.0 DESCRIPTION AND FEATURES
1.1 General Description
WD Scorpio 2.5-inch drives offer fast performance and low power consumption, making them
ideal for notebooks and other portable devices.
1.2 Product Features
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.
Reduced Power Spinup (RPS) — WD’s optimized start up feature specifically
designed for the external hard drive and Consumer Electronics (CE) market. Specific
focus for RPS is to minimize the duration and magnitude of the peak power consumption
from the hard drive.
Ramp Load/Unload (LUL) — LUL is a proven design that parks the recording head
when the drive is idle and on spin up, maximizing available disk space and minimizing
power usage, which results in lower transient acoustics, lower heat, and long-term drive
reliability.
System-on-Chip - The System-on-Chip (SOC) is the foundation for WD's next
generation electronics and firmware architecture. The SOC lowers component count by
integrating a hard disk controller, high performance processor, high speed execution
SRAM, and read channel in a 128-pin package.
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.
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.
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.
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 drive.
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.

Description and Features WD Scorpio ML160M
2 RELEASED 1/16/09 (WD CONFIDENTIAL) 2679-701205-A00
Dual Drive Operation — These hard drives support ATA dual drive operations. You can
attach another hard drive to the WD hard drive by designating one as the master and the
other as slave.
High-Speed Data Transfer Support —These hard drives support all data transfer
modes up to Mode 5 Ultra ATA 100. Data transfer modes supported include PIO modes
0-4, Multi-word DMA modes 0-2, and Ultra ATA modes 0-5.
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 — WD EIDE drives support 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.
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.

WD Scorpio ML160M Specifications
2679-701205-A00 RELEASED 1/16/09 (WD CONFIDENTIAL) 3
2.0 SPECIFICATIONS
2.1 Performance Specifications
Average Seek1
- Read
- Write 12.0 ms average 13.0 ms average
Track-to-Track Seek 12.0 ms average
Full Stroke Seek 21 ms average
Index Pulse Period 11.1 ms (nominal)
Average Latency 5.5 ms
Rotational Speed 5400 RPM
Data Transfer Rate (maximum)
- Buffer to Host
- Max buffer to disk
100 MB/s (Mode 5 Ultra ATA)
66.6 MB/s (Mode 4 Ultra ATA)
33.3 MB/s (Mode 2 Ultra ATA)
16.6 MB/s (Mode 4 PIO)
16.6 MB/s (Mode 2 multi-word DMA)
97 MB/s maximum
Interleave 1:1
Buffer Size 8 MB
Error Rate - Unrecoverable <1 in 1014 bits read
Spindle Start Time
- From Power-on to Drive Ready 3 4.0s average
- From Power-on to Rotational Speed 4 2.0s average
Spindle Stop Time 8.0s average
Load/Unload Cycles5600,000
1During continuous Seek, Read, or Write commands, an algorithm in the code will add latency as required to keep
the VCM motor from overheating;s seek performance will be impacted under this condition.
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.

Specifications WD Scorpio ML160M
4 RELEASED 1/16/09 (WD CONFIDENTIAL) 2679-701205-A00
2.2 Physical Specifications
Physical
Specifications
WD800BEVE WD1200BEVE WD1600BEVE WD2500BEVE WD3200BEVE
Capacity180,026 MB 120,034 MB 160,041 MB 250,059 MB 320,072 MB
Interface 44-pin EIDE 44-pin EIDE 44-pin EIDE 44-pin EIDE 44-pin EIDE
Actuator Type Rotary Voice
Coil
Rotary Voice
Coil
Rotary Voice
Coil
Rotary Voice
Coil
Rotary Voice
Coil
NumberofDisks11122
DataSurfaces12244
NumberofHeads12244
Bytes per Sector 512 512 512 512 512
User Sectors per
Drive 156,301,488 234,441,648 312,581,808 488,397,168 625,142,448
Servo Type Embedded Embedded Embedded Embedded Embedded
Recording Method Partial DC
Target
Partial DC
Target
Partial DC
Target
Partial DC
Target
Partial DC
Target
ECC Reed-Solomon Reed-Solomon Reed-Solomon Reed-Solomon Reed-Solomon
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.

WD Scorpio ML160M Specifications
2679-701205-A00 RELEASED 1/16/09 (WD CONFIDENTIAL) 5
2.2.1 Physical Dimensions
English Metric
Dimension Tolerance Dimension Tolerance
Height 0.374 inches ±0.01 inch 9.50 mm ±0.20 mm
Length 3.94 inches ±0.01 inch 100.00 mm ±0.25 mm
Width 2.75 inches ±0.01 inch 69.85 mm ±0.25 mm
Weight (typical) 0.22 pounds — 99 gm —

Specifications WD Scorpio ML160M
6 RELEASED 1/16/09 (WD CONFIDENTIAL) 2679-701205-A00
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

WD Scorpio ML160M Specifications
2679-701205-A00 RELEASED 1/16/09 (WD CONFIDENTIAL) 7
2.4 Electrical Specifications
2.4.1 Current Requirements and Power Dissipation
Figure 2-2. Typical +5V Current Draw During Spinup
Note: Current is 200 mA per 10 mV vertical deflection.
Operating Mode Mean Current1Power, Average1
5 VDC
Spinup (max) 1000 mA 5.0W
Spinup 700 mA 3.5W
Read/Write 500 mA 2.5W
Seek 500 mA 2.5W
POWER MANAGEMENT COMMANDS
Operating Mode Mean Current1Power, Average1
5 VDC
Idle (E1H)
Performance (mode 1) 400 mA 2.0W
Active (mode 2) 260 mA 1.3W
Low Power (mode 3) 170 mA 0.85W
Standby (E0H) 60 mA 0.3W
Sleep (E6H) 60 mA 0.3W
1All values are typical (25°C and 5V input) except where specified as maximum.
Note: Current measurements cut off frequency at 1 kHz.

Specifications WD Scorpio ML160M
8 RELEASED 1/16/09 (WD CONFIDENTIAL) 2679-701205-A00
2.4.2 Input Voltage Requirements
The input voltage requirement for these drives is +5.0V ± 5%.
2.4.3 Ripple
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 or swept sinusoidal excitation in each linear axis, one
axis at a time. The drive incurs no physical damage and no hard errors while operating and
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 or swept sinusoidal 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.
Drive Generated Vibration
Drives are tested by supporting a single drive horizontally in a free-free state and measuring
the side-to-side vibration. Self vibration may not exceed the level listed in Table 2-1.
Rotational Shock Non-Operating
Drives are tested by applying a rotational force centered around the actuator pivot. The drive
incurs no physical damage when subjected to the rotational force specified 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.
+5 VDC
Maximum
Frequency 100 mV (double amplitude) 0-30 MHz
Shock
Operating (2 ms) 300G
Non-operating (1 ms) 900G
Note: Half-sine wave, measured without shock isolation and without non-recoverable errors.
Vibration
Operating 0.00459 g2/Hz (10-500 Hz)
Non-operating 0.05102 g2/Hz (10-500 Hz)
Drive Generated Vibration
Operating 0.15 gm-mm average with the drive in an unconstrained condition
Rotational Shock Non-Operating
Amplitude 30K rad/sec2
Duration 2 ms

WD Scorpio ML160M Specifications
2679-701205-A00 RELEASED 1/16/09 (WD CONFIDENTIAL) 9
2.5.2 Temperature and Humidity
2.5.3 Thermocouple Location
Figure 2-3. Drive Base Casting Thermocouple Location
Temperature & Humidity
Operating ambient temperature10°C to 60°C (32°F to 140°F)
Max base casting temperature 2 60°C (140°F)
Humidity 8-90% RH non-condensing
29.4°C (maximum wet bulb)
Thermal Gradient 20°C/hour (maximum)
Humidity Gradient 20%/hour (maximum)
Non-operating Temperature -40°C to 65°C (-40°F to 149°F)
Humidity 5-95% RH non-condensing
40°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 surface temperatures as defined.
2See Figure 2-3.
Component Location
Drive base casting #1, Figure 2-3

Specifications WD Scorpio ML160M
10 RELEASED 1/16/09 (WD CONFIDENTIAL) 2679-701205-A00
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 2-4.
Figure 2-4. 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
1 Disk 2 Disk
Idle Mode (average dBA) 222 25
Seek Mode (average dBA) 3, 4 25 28
1Measured per ECMA-74/ISO 7779.
2No audible pure tones.
3Random seek at a rate of 26 seeks per second.
4Seek mode selectable with the Automatic Acoustic Management feature.
Component Design Life 5 years
AFR <0.5%1
Duty Cycle 40%
Power on Hours (POH) 3120
1Ambient temperature 30°C, HDD temperature 40°C.

WD Scorpio ML160M Specifications
2679-701205-A00 RELEASED 1/16/09 (WD CONFIDENTIAL) 11
2.7 Interface Connector Pin Assignments
The WD Scorpio interfaces with the host I/O bus via the 44-pin connector (J2) illustrated in
Figure 2-5. Table 2-2 identifies the pin numbers of the J2 connector and the corresponding
signal names and signal functions.
Figure 2-5. Standard Factory Connectors
Table 2-2. Device Pin Connector Pin Definitions
PIN MNEMONIC I/O DESCRIPTION
1 RESET- IHost Reset
Initializes the WD Scorpio drive when asserted.
3, 5, 7,
9, 11
13, 15.
17
4, 6, 8,
10, 12,
14, 16,
18
DD7-DD0
DD8-DD15 I/O
Host Data Bus Bits 7-0 and 8-15
The lower data bus is an 8-bit, tristate directional bus for
transferring status, data, and control information between the
host and the drive. The upper data bus is used for 16-bit data
transfers only.
2, 19,
22, 24,
26, 30,
40
GND Ground.
20 Key - not connected.
21 DMARQ ODMA Request
Drive DMA signal Request to host (DMA only).
In UDMA mode is a drive initiation control signal.
23 DIOW-
STOP I
I/O Write
The host or DMA controller asserts IOW- when a data or control
byte is written to the WD Scorpio drive.
In UDMA mode is a stop control signal.
25 DIOR-
HDMARDY-
HSTROBE
I
I/O Read
The host or DMA controller asserts IOR- when a data or status
byte is read from the WD Scorpio drive.
In UDMA read mode is a receiver pause control signal.
In UDMA write mode is a data clock signal.
27 IORDY
DSTROBE-
DDMARDY-
O
I/O Channel Ready
Drive ready signal to host. Used with host systems that support
Flow Control Protocol to maximize burst transfer rates.
In UDMA read mode is a data strobe.
In UDMA write mode is a DMA ready signal.
28 CSEL ICable Select
Configures the drive status as either a master or slave drive.
29 DMACK- IDMA Acknowledge
DMA handshake line asserted by host in response to
HDMAREQ.
31 INTRQ OHost Interrupt Request
The WD Scorpio drive asserts INTRQ to request interrupt service
from the host.
32 IOCS16- OI/O Channel Select 16
Identifies data transfers to or from the host as 16 bits wide.

Specifications WD Scorpio ML160M
12 RELEASED 1/16/09 (WD CONFIDENTIAL) 2679-701205-A00
2.8 Agency Approvals
ML160M Regulatory Number (R/N): 701532
The WD Scorpio meets 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. 60950-1-
03/UL 60950-1. Standard for Safety of Information Technology Equipment, including
Electrical Business Equipment (File E101559).
TUV Essen Laboratories: IEC-950 (EN60950) Standard for Safety of Information
Technology Equipment, including Electrical Business Equipment. EN60065. Standard of
Safety for Audio, Video, and Similar Electronic Apparatus.
CE Compliance for Europe: Verified to comply with EN55022:1998 for RF Emissions
and EN55024:1998 for Generic Immunity as applicable.
C-Tick Compliance for Australia: Verified to comply with AS/NZ3548 for RF
Emissions as required by the Australian Communications Authority.
Korean RRL Mark: Registered as a Class-B product with the South Korean Ministry of
Information and Communication.
Taiwan BSMI EMI Certification: Certified as a Class-B product with the Bureau of
Standards Metrology and Inspection (BSMI).
2.9 Full Model Number Specification
Table 2-3 below provides a summary specification of the model number suffix for this product
platform.
Table 2-3. Full Model Number Description
34 PDIAG- I/O Passed Diagnostics
Output from slave drive when it has passed its diagnostics. Input
to master drive.
35, 33,
36 DA0-DA2 IHost Address Bus A0, A1, and A2 address I/O ports 0 through 7.
37 CS0- IHost Chip Select 0
The host asserts HCS0- to address and communicate with the
WD Scorpio drive on the I/O channel.
38 CS1- IHost Chip Select 1
The host asserts HCS1 to address and communicate with the
WD Scorpio drive auxiliary registers.
39 DASP-
O
Drive Active/Slave Present
This open collector output is a time-multiplexed signal indicating
drive active or slave present. At reset, this signal is an output
from the slave drive and an input to the master drive, showing
that a slave drive is present. For all times other than reset,
HDASP- is asserted by the master and slave drives during
command execution.
41 +5V Power
42 +5V Power
43 GND Power Ground
44 Reserved - not connected.
Model Number Format ID Product Brand RPM Description
WDxxxxBEVE-XXA0HTX A0H WD Scorpio®Blue™ 5400 ML160M 8 MB EIDE