Deskstar T7K500 Hard Disk Drive Specification
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12.17 Read Log Ext (2Fh)
Table 94: Read Log Ext Command (2Fh)
This command returns the specified log to the host. The device shall interrupt for each DRQ block transferred.
Output parameters to the device
Sector Count Current The number of sectors to be read from the specified log low order, bits (7:0). The
log transferred by the drive shall start at the sector in the specified log at the spec-
ified offset, regardless of the sector count requested.
Sector Number Previous The number of sectors to be read from the specified log high orders, bits (15:8).
Sector Number Current The log to be returned as described in the figure below.
Cylinder Low Current The first sector of the log to be read low order, bits (7:0).
Cylinder Low Previous The first sector of the log to be read high order, bits (15:8).
Command Block Output Registers Command Block Input Registers
Register 7 6 5 4 3 2 1 0 Register 7 6 5 4 3 2 1 0
Data Low - - - - - - - - Data Low - - - - - - - -
Data High - - - - - - - - Data High - - - - - - - -
Feature
Current - - - - - - - -
Error see below
Previous - - - - - - - -
Sector
Count
Current V V V V V V V V
Sector
Count
HOB=0 - - - - - - - -
Previous V V V V V V V V HOB=1 - - - - - - - -
Sector
Number
Current V V V V V V V V
Sector
Number
HOB=0 - - - - - - - -
Previous - - - - - - - - HOB=1 - - - - - - - -
Cylinder
Low
Current V V V V V V V V
Cylinder
Low
HOB=0 - - - - - - - -
Previous V V V V V V V V HOB=1 - - - - - - - -
Cylinder
High
Current - - - - - - - - Cylinder
High
HOB=0 - - - - - - - -
Previous - - - - - - - - HOB=1 - - - - - - - -
Device/Head 1 - 1 D - - - - Device/Head - - - - - - - -
Command 0 0 1 0 1 1 1 1 Status See below ...
Error Register Status Register
7654321 0 76543 21 0
CRC UNC 0 IDN 0 ABT T0N AMN BSY RDY DF DSC DRQ COR IDX ERR
0V0V0V0 0 0V0V- 0- V
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