Hitachi HDS723020BLA642 - Command Error; Table 105 Command Error Information

Hitachi hard disk drive specifications
157
11.18.5 Command Error
Table 105 defines the format of the Command Error data structure.
Byte
7
6
5
4
3
2
1
0
0
NQ
Reserved
TAG
1
Reserved
2
Status
3
Error
4
Sector Number
5
Cylinder Low
6
Cylinder High
7
Dev/Head
8
Sector Number Previous
9
Cylinder Low Previous
10
Cylinder High Previous
11
Reserved
12
Sector Count
13
Sector Count Previous
14 - 255
Reserved
256 – 510
Vendor Unique
511
Data Structure Checksum
Table 105 Command Error information
The TAG field (Byte 0 Bits 4-0) contains the tag number corresponding to a queued command if the NQ bit is
cleared.
The NQ field (Byte 0 Bit 7) indicates whether the error condition was a result of a non-queued or not. If it is
cleared the error information corresponds to a queued command specified by the tag number indicated in the
TAG field.
The bytes 1 to 13 correspond to the contents of Shadow Register Block when the error was reported.
The Data Structure Checksum (Byte 511) contains the 2‟s complement of the sum of the first 511 bytes in the
data structure. The sum of all 512 bytes of the data structure will be zero when the checksum is correct.