Self-Test Log Data Structure; Figure 132. Self-Test Log Data Structure - Hitachi IC25N040ATCS04-0 - Travelstar 40GN 40GB UDMA/100 4200RPM 2MB 2.5" IDE Hard Drive Specifications

13.32.5 Self-test log data structure

The following defines the 512 bytes that make up the Self-test log sector. All multibyte fields shown in
these data structures follow the ATA/ATAPI-5 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 log pointer
Reserved
Data structure checksum
Note: N is 0 through 20

Figure 132. Self-test log data structure

The data structure contains the descriptor of the 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 the new descriptor.
The self-test log pointer points to the most recent descriptor. When there is no descriptor, the value is 0.
When there are descriptor(s), the value is 1 through 21.
Hitachi Travelstar 60GH & 40GN hard disk drive specifications
Byte Offset
2 00h
1 n*18h+02h
1 n*18h+03h
2 n*18h+04h
1 n*18h+06h
4 n*18h+07h
15 n*18h+08h
2 1FAh
1 1FCh
2 1FDh
1 1FFh
512
180