Hitachi DK23EB - Travelstar Series 20 GB Hard Drive Specifications page 69

(3) SMART Self-test Log Sector [Log Sector Address = 06h]
Following Table defines the 512 bytes that make up the SMART self-test log sector.
Byte
0 - 1
2 - 25
26 - 49
:
482 - 505
506 - 507
508
509 - 510
511
Self-test log descriptor entry
This log is viewed as a circular buffer. The first entry begins at byte 2, the second entry begins at byte 26,
and so on until the twenty-second entry, that replaces the first entry. Then, the twenty-third entry replaces
the second entry, and so on. If fewer than 21 self-tests have been performed by the device, the unused
descriptor entries are filled with zeros. The content of the self-test descriptor entry is shown in following table.
Byte
n
n+1
n+2 ~ n+3
n+4
n+5 ~ n+8
n+9 ~ n+23
K6602743
Rev.2
02.12.'02
Descriptions
Self-test log data structure revision number
The value of Self-test log data structure revision number is 0001h
st
1 descriptor entry
nd
2 descriptor entry
:
st
21 descriptor entry
Vendor Specific
Self Test index
The self-test index points to the most recent entry. Initially, when the log is empty,
the index is set to zero. It is set to one when the first entry is made, two for the
second entry, etc., until the 22nd entry, when the index is reset to one.
Reserved
Data structure checksum
Table 6.16 Self-test log descriptor entry
Content of the Sector Number
Content of the Sector Number register is the content of the Sector Number register
when the Nth self-test subcommand was issued.
Content of the self-test execution status byte
Content of the self-test execution status byte is the content of the self-test execution
status byte when the Nth self-test was completed.
Life timestamp
Life timestamp contains the power-on lifetime of the device in hours when the Nth
self-test subcommand was completed.
Content of the self-test failure checkpoint byte
Content of the self-test failure checkpoint byte is the content of the self-test failure
checkpoint byte when the Nth self-test was completed.
Falling LBA
The failing LBA is the LBA of the uncorrectable sector that caused the test to fail. If
the device encountered more than one uncorrectable sector during the test, this
field shall indicate the LBA of the first uncorrectable sector encountered. If the test
passed or the test failed for some reason other than an uncorrectable sector, the
value of this field is undefined.
Vendor Specific
Descriptions
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