Western Digital Blue WD20SPZX Technical Reference Manual page 41

WORD FIELD DESCRIPTION
READ/WRITE MULTIPLE support
Bit 15-8: 80h
Bit 7-0: 00h: Reserved
47
01h-FFh = Maximum number of logi-
cal sectors that shall be transferred
per DRQ data block on READ/WRITE
MULTIPLE commands
Trusted Computing feature set
options
Bit 15: Shall be cleared to zero
Bit 14: Shall be set to one
48
Bit 13-1: Reserved for the Trusted
Computing Group
Bit 0: If set, Trusted Computing fea-
ture set is supported
Capabilities
Bit 15-14: Reserved for the IDENTIFY
PACKET DEVICE command.
Bit 13: If set, Standby timer values as
specified in this standard are sup-
ported
0 = Standby timer values shall be
managed by the device
Bit 12: Reserved for the IDENTIFY
PACKET DEVICE command.
49
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: Long Physical Sector Alignment
Error reporting
Capabilities
Bit 15: Shall be cleared to zero.
Bit 14: Shall be set to one.
Bit 13-2: Reserved.
50
Bit 1: Obsolete
Bit 0: 1 = There is a minimum Standby
time value and it is vendor specific.
0 = There is no minimum
Standby timer value.
51-52 Obsolete
Additional Words Valid
Bit 15-8: Free-fall Control Sensitivity
Bit 7-3: Reserved
53
Bit 2: If set, the fields reported in
word 88 are valid
Bit 1: If set, the fields reported in
words (64-70) are valid
Bit 0: Obsolete
WESTERN DIGITAL CONFIDENTIAL
ATA Command Set
F=fixed
V=variable
X= not defined
- 41 -
Drive Program
Power-on Default Value
F
F
8010h
F
F
4000h
F
F
2F00h
F
F
F
F
V
F
F
4001h
X
F
X 0000h
V
0006h
F
F
X