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11.8.43 Read Log EXT (2Fh)
COMMAND CODE
0 0 1 0 1 1 1 1
REGISTER
REGISTER SETTING NORMAL COMPLETION
DR drive no. no change
LBA
Low
Current
Previous
log address
Reserved
HOB=0
HOB=1
Reserved
Reserved
LBA
Mid
Current
Previous
Sector offset(7:0)
Sector offset(15:8)
HOB=0
HOB=1
Reserved
Reserved
LBA
High
Current
Previous
Reserved
Reserved
HOB=0
HOB=1
Reserved
Reserved
SC Current
Previous
sector count(7:0)
sector count(15:8)
HOB=0
HOB=1
Reserved
Reserved
FT Current
Previous
Reserved
Reserved
HOB=0
HOB=1
no change
no change
This command returns the specified log to the host. The device shall interrupt for each DRQ block
transferred.
Sector Count - Specifies the number of sectors to be read from the specified log. The log transferred by the
drive shall start at the sector in the specified log at the specified offset, regardless of the sector count
requested.
LBA Low - Specifies the log to be returned as described in the following Table.
LBA Mid - Specifies the first sector of the log to be read.
Log Sector
Log sector address Content R/W
00h Log directory RO
01h SMART error log See Note
02h Comprehensive SMART error log See Note
03h Extended comprehensive SMART error log RO
04h-05h Reserved -
06h SMART self-test log See Note
07h Extended SMART self-test log RO
08h Reserved -
09h Selective self-test log See Note
0Ah-7Fh Reserved -
80h-9Fh Host vendor specific R/W
A0h-FFh Reserved -
Key −
RO –Log is read only by the host.
R/W –Log is read or written by the host.
NOTE - Log addresses 01h,02,,06h and 09h are used by the SMART READ LOG
command commands. If these log addresses are used with the READ LOG EXT
command, the device shall return command aborted.
11.8.43.1 General Purpose Log Directory
The following table defines the 512 bytes that make up the General Purpose Log Directory.