Western Digital Blue WD20SPZX Technical Reference Manual page 45

WORD FIELD DESCRIPTION
Major Version Number
Bit 15-11: Reserved
Bit 10: if set, supports ACS-3
Bit 9: if set, supports ACS-2
Bit 8: if set, supports ATA8-ACS
80
Bit 7: if set, supports ATA/ATAPI-7
Bit 6: if set, supports ATA/ATAPI-6
Bit 5: if set, supports ATA/ATAPI-5
Bit 4–1: Obsolete
Bit 0: Reserved
81 Minor Version Number
Command and feature sets sup-
ported
Bit 15: Obsolete
Bit 14: If set, NOP command sup-
ported
Bit 13: If set, Read buffer command
supported
Bit 12: If set, Write buffer command
supported
Bit 11-10: Obsolete
Bit 9: If set, Device Reset command
supported
Bit 8-7: Obsolete
82
Bit 6: If set, look-ahead supported
Bit 5: If set, The volatile write cache
supported
Bit 4: Cleared to 0 to indicate that
the PACKET feature set is not sup-
ported.
Bit 3: If set, mandatory Power Man-
agement Feature Set supported
Bit 2: Obsolete
Bit 1: If set, Security Feature Set sup-
ported
Bit 0: If set, SMART Feature Set sup-
ported
WESTERN DIGITAL CONFIDENTIAL
ATA Command Set
F=fixed
V=variable
X= not defined
F
F
F
F
F
F
X
F
X
F
F
F
X
F
X
F
F
F
F
X
F
F
- 45 -
Drive Program
Power-on Default Value
07FEh
006Dh
706Bh