WD Green MB500M-6Gb AT Command Set
2679-771422-A00 RELEASED 5/2/13 (WD CONFIDENTIAL) 27
4.3 Identify Device (ECh)
The Identify Device command transfers 512 bytes of data that specify the drive’s parameters. Table 4-7
lists the parameters read by the host.
Table 4-7. Identify Device Command
WORD FIELD DESCRIPTION VALUE
0 General Configuration 427Ah
1Obsolete XXXX
2 Specific Configuration XXXX
3Obsolete XXXX
4-5 Retired 0
6Obsolete XXXX
7-8 Reserved for assignment by the CompactFlash™ Association 0
9 Retired 0
10-19 Serial Number (ATA String) WDnnnnnnnn
20-21 Retired XXXX
22 Obsolete 0
23-26 Firmware Revision (ATA String) nnnn
27-46 Model Numbers (ATA String) “WDC WD20NPVX-nnnnnnn”
“WDC WD15NPVX-nnnnnnn”
47 READ/WRITE MULTIPLE support
Bit 15-8: 80h
Bit 7-0: 00h: Reserved
01h-FFh = Maximum number of logical sectors that shall be
transferred per DRQ data block on READ/WRITE
MULTIPLE commands
8010h
48 Trusted Computing feature set options
Bit 15: Shall be cleared to zero
Bit 14: Shall be set to one
Bit 13-1: Reserved for the Trusted Computing Group
Bit 0: If set, Trusted Computing feature set is supported
4000h
49 Capabilities
Bit 15-14: Reserved for the IDENTIFY PACKET DEVICE
command.
Bit 13: If set, Standby timer values as specified in this
standard are supported.
0 = Standby timer values shall be managed by the device
Bit 12: Reserved for the IDENTIFY PACKET DEVICE
command
Bit 11: If set, IORDY supported
Bit 10: If set, IORDY may be disabled
Bit 9: If set, LBA supported
Bit 8: If set, DMA supported
Bit 7-2: Reserved
Bit 1: Current Long Physical Alignment Setting
2F00h
50 Capabilities
Bit 15: Shall be cleared to zero.
Bit 14: Shall be set to one.
Bit 13-2: Reserved.
Bit 1: Obsolete
Bit 0: Shall be set to one to indicate a device specific
Standby timer value minimum
4001h
51-52 Obsolete 0
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