Technical information

HGST Ultrastar C15K600 Hard Disk Drive Specification
217
Table 184 Error History Directory Entry
Byte
Bit
7
6
5
4
3
2
1
0
0
Supported Buffer ID
1-3
Reserved
4-7
(MSB)
Maximum Available Length
(LSB)
• Supported Buffer ID field indicates the error history buffer ID associated with this entry.
• Maximum Available Length field indicates the maximum number of data bytes contained in the buffer
indicated by the Supported Buffer ID field. The actual number of bytes available for transfer may be smaller.
Unless an error is encountered, the drive will return parameter data that contains error history in a vendor
specific format from the error history snapshot from the specified buffer at the specified buffer offset.
If the drive receives a READ BUFFER command with the Mode field set to 1Ch from the established error
history I_T nexus and the Buffer ID field is set to a value that the error history directory shows as not
supported, then the drive will terminate the command with Check Condition status with the sense key set to
Illegal Request and the additional sense code set to Invalid Field In CDB.
If the value in the Buffer Offset field is not supported, the device server shall terminate the command with
Check Condition status with the sense key set to Illegal Request and the additional sense code set to
Invalid Field In CDB.
The amount of error history in the specified buffer shall be less than or equal to the number of bytes
indicated by the Maximum Available Length field in the error history directory.