HGST Ultrastar 7K4000 (SAS) Hard Disk Drive Specification
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18.10.9.1 Control Extension Subpage 01h
Table 112: Control Extension Subpage 01h
• TCMOS (Timestamp Changeable By Methods Outside This Standard): set to zero to specify that the timestamp shall
not be changed by any method except those defined by this standard.
• SCSIP (SCSI Precedence): set to zero to specify that methods outside this standard may change the timestamp and that
the SET TIMESTAMP command is illegal.
• IALUAE (Implicit Asymmetric Logical Unit Access Enabled): set to zero to specify that implicitly managed transi-
tions between primary target port asymmetric access states are disallowed and indicates that implicitly managed tran-
sitions between primary target port asymmetric access states are disallowed or not supported.
• Initial Command Priority: set to zero to indicate that the device server does not support priorities with the SET
PRIORITY command.
• Maximum Sense Data Length: specifies the maximum number of bytes of sense data the device server shall return in
the same I_T_L_Q nexus transaction as the status. A Maximum Sense Data Length field set to zero specifies that
there is no limit. The device server shall not return more sense data bytes in the same I_T_L_Q nexus transaction as
the status than the smaller of the length indicated by the:
a) Maximum Sense Data length field; and
b) Maximum Supported Sense Data Length field in the Extended INQUIRY VPD page (Page 86h).
18.10.9.2 Control Extension Subpage 02h
Table 113: Application Tag mode page:
Byte
Bit Default
765432 10
0 PS SPF=1 Page Code = 0Ah 4Ah
1 Subpage Code = 1 01h
2-3 Page Length = 001Ch 001Ch
4 Reserved = 0 TCMOS=0 SCSIP=0
IAL-
UAE = 0
00h
5 Reserved = 0 Initial Priority = 0 00h
6 Maximum Sense Data Length 00h
7-31 Reserved = 0 00h
Byte
Bit
765432 10
0 PS SPF=1 Page Code = 0Ah
1 Subpage Code = 02h
2-3 Page Length = n-4
4-15 Reserved = 0
16-39 Application Tag descriptor [first]
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