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
1
Obsolete
XXXX
2
Specific Configuration
XXXX
3
Obsolete
XXXX
4-5
Retired
0
6
Obsolete
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
