Command Error; Table 105 Command Error Information - Hitachi HDS723020BLA642 Specifications

11.18.5 Command Error

Table 105
defines the format of the Command Error data structure.
Byte
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14 - 255
256 – 510
511

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.
7 6 5
NQ Reserved
Sector Number
Cylinder Low
Cylinder High
Sector Number Previous
Cylinder Low Previous
Cylinder High Previous
Sector Count
Sector Count Previous
Vendor Unique
Data Structure Checksum
Hitachi hard disk drive specifications
157
4 3 2 1
TAG
Reserved
Status
Error
Dev/Head
Reserved
Reserved
0