Table 239 Self-Test Log Data Structure - Western Digital Ultrastar DC HC310 Specifications

State field contains a value indicating the device state when command was issued to the device.
Value State
x0h Unknown
x1h Sleep
x2h Standby (If the EPC feature set is enabled, Standby is standby_y or standby_z)
x3h Active/Idle
(If the EPC feature set is enabled, Active/Idle is idle_a or idle_b or idle_c)
x4h SMART Off-line or Self-test
x5h-xAh Reserved
xBh-xFh Vendor specific
Note: The value of x is vendor specific.
11.51.6 Self-test log data structure
The following defines the 512 bytes that make up the Self-test log sector. All multi-byte fields shown in these data
structures follow the ATA/ATAPI-7 specifications for byte ordering.
Description
Data structure revision
Self-test number
Self-test execution status
Life time power on hours
Self-test failure check point
LBA of first failure
Vendor specific
...
Vendor specific
Self-test index
Reserved
Data structure checksum
Note: n is 0 through 20

Table 239 Self-test log data structure

The data structure contains the descriptor of Self-test that the device has performed. Each descriptor is 24 bytes
long and the self-test data structure is capable to contain up to 21 descriptors.
After 21 descriptors have been recorded, the oldest descriptor will be overwritten with new descriptor.
Self-test index points the most recent descriptor. When there is no descriptor the value is 0. When there is
descriptor(s) the value is 1 through 21.
Western Digital Hard Disk Drive OEM Specification
Bytes Offset
2
1 n*18h+02h
1 n*18h+03h
2 n*18h+04h
1 n*18h+06h
4 n*18h+07h
15 n*18h+0Bh
2
1
2
1
512
275
00h
1Fah
1FCh
1FDh
1FFh