5K250 (SATA) OEM Specification
Page 152 of 171
14.39.6 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 Bytes Offset
Data structure revision 2 00h
Self-test number 1 n*18h+02h
Self-test execution status 1 n*18h+03h
Life time power on hours 2 n*18h+04h
Self-test failure check point 1 n*18h+06h
LBA of first failure 4 n*18h+07h
Vendor specific 15 n*18h+0Bh
...
Vendor specific 2 1FAh
Self-test log pointer 1 1FCh
Reserved 2 1FDh
Data structure checksum 1 1FFh
512
Note: n is 0 through 20
Table 121 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 has been recorded, the oldest descriptor will be overwritten with new descriptor.
Self-test log pointer 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.
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