Текст страницы
12.21.6.1 Contents of the Pending Defects log
The size of the log may change as a result of a power on reset or activating new firmware (e.g., DOWNLOAD
MICROCODE command). Table 141 defines the format of the Pending Defects log for page 0. Table 142 defines the
format of all subsequent pages of the log. The size (i.e., number of pages) of the Pending Defects log is indicated in
Section 12.21.1.
Table 141 Pending Defects log (page 0)
Offset
Type
Description
0..3
DWord
Number of Log Descriptors field
4..15
Reserved
16..31
Bytes
Pending Defects Log descriptor 0
32..47
Bytes
Pending Defects Log descriptor 1
…
…
496..511
Bytes
Pending Defects Log descriptor 30
Table 142 Pending Defects log (page 1..n)
Offset
Type
Description
0..15
Bytes
Pending Defects Log descriptor 31 + ((log page number–1) x 32)
16..31
Bytes
Pending Defects Log descriptor 32 + ((log page number–1) x 32)
…
…
496..511
Bytes
Pending Defects Log descriptor 62 + ((log page number–1) x 32)
12.21.6.2 Number of Log Descriptors field
The NUMBER OF LOG DESCRIPTORS field indicates the number of Pending Defects descriptors in the Pending
Defects log. If the value of the NUMBER OF LOG DESCRIPTORS field is greater than or equal to FFFEh, the device
shall not add more Pending Defects descriptors to the log and the NUMBER OF LOG DESCRIPTORS field shall not
be changed.
There shall be no unused Pending Defects descriptors (see Section 12.21.6.3) included in the range specified by the
NUMBER OF LOG DESCRIPTORS field. The number of Pending Defects descriptors in the Pending Defects log is
vendor specific.
12.21.6.3 Pending Defects descriptor format
Each Pending Defects descriptor indicates a logical sector that is associated with an uncorrectable media error.
Unused Pending Defects descriptors shall be cleared to zero. Table 143 defines the format of each Pending Defects
descriptor.
Table 143 Pending Defects descriptor format
Offset
Type
Description
0..3
DWord
POWER ON HOURS field
4..7
Bytes
Reserved
8..15
QWord
LBA field
At the time that a Pending Defects descriptor is created, the device shall set the POWER ON HOURS field to the
current value of the Power On Hours device statistic if the Power On Hours device statistic is supported and is valid;
and Power On Hours filed will be filled with FFFF_FFFFh if the Power On Hours device statistic is not supported or
is not valid.
The LBA field indicates the LBA that is associated with an uncorrectable media error.
209
Hard Disk Drive Specification