IBM IC25N020ATDA04 - Travelstar 20 GB Hard Drive - Figure 127. Self-Test Log Data Structure; Self-Test Log Data Structure

13.33.5 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.
512
1FFh1Data structure checksum
1FDh2Reserved
1FCh1Self-test log pointer
1FAh2Vendor specific
...
n*18h+08h15Vendor specific
n*18h+07h4LBA of first failure
n*18h+06h1Self-test failure check point
n*18h+04h2Life time power on hours
n*18h+03h1Self-test execution status
n*18h+02h1Self-test number
00h2Data structure revision
OffsetByteDescription
Figure 127. 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 one or more descriptor, the value is 1 through 21.
Travelstar 48GH, 30GN & 15GN hard disk drive specifications
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