HGST Ultrastar 7K4000 (SAS) Hard Disk Drive Specification
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Table 114: Application Tag descriptor format
•A LAST bit set to one specifies that this Application Tag descriptor is the last valid Application Tag descriptor in
the Application Tag mode page. A LAST bit set to zero specifies that the Application Tag descriptor is not the
last valid Application Tag descriptor in the Application Tag mode page.
•The LOGICAL BLOCK APPLICATION TAG field specifies the value to be compared with the LOGICAL BLOCK
APPLICATION TAG field associated with data read or written to the LBA.
•The LOGICAL BLOCK ADDRESS field contains the starting LBA for this Application Tag descriptor. The LOGICAL
BLOCK ADDRESS field in the first Application Tag descriptor shall be set to 0000_0000_0000_0000h. For subsequent
Application Tag descriptors, the contents of the LOGICAL BLOCK ADDRESS field shall contain the sum of the values in:
a) the LOGICAL BLOCK ADDRESS field in the previous Application Tag descriptor; and
b) the LOGICAL BLOCK COUNT field in the previous Application Tag descriptor.
The sum of the LOGICAL BLOCK ADDRESS field in the Application Tag descriptor with the LAST bit set to one and
the LOGICAL BLOCK COUNT field in the Application Tag descriptor with the LAST bit set to one shall equal the
RETURNED LOGICAL BLOCK ADDRESS field in the READ CAPACITY (16) parameter data (see 5.16.2).
If an invalid combination of the LAST bit, LOGICAL BLOCK APPLICATION TAG field, and LOGICAL BLOCK
ADDRESS field are sent by the application client, then the device server shall terminate the MODE SELECT command (see
SPC-4) with CHECK CONDITION status with the sense key set to ILLEGAL REQUEST and the
additional sense code set to INVALID FIELD IN PARAMETER LIST.
•The LOGICAL BLOCK COUNT field specifies the number of logical blocks to which this Application Tag descriptor
applies.
A LOGICAL BLOCK COUNT field set to 0000_0000_0000_0000h specifies that this Application Tag descriptor shall be
ignored.
• Busy Timeout Period is not supported and is ignored.
• Extended Self-test Routine Completion Time is an advisory parameter that an Initiator may use to determine the time
in seconds that the Target requires to complete self-test routine when the Target is not interrupted by an Initiator and
no errors occur during execution of the self-test routine.
... ...
(n-24)-n Application Tag descriptor [last]
Byte
Bit
765432 10
0 Last Reserved = 0
1-5 Reserved = 0
6-7 Logical Block Application Tag
8-15 Logical Block Address
16-23 Logical Block Count
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