Deskstar T7K500 Hard Disk Drive Specification
198
12.28 Read Verify Sectors Ext (42h)
Table 117: Read Verify Sectors Ext command (42h)
The Read Verify Sector(s) Ext command verifies one or more sectors on the device. No data is transferred to the
host.
The difference between the Read Sector(s) command and the Read Verify Sector(s) command is whether data is
transferred to the host or not.
If an uncorrectable error occurs, the Read Verify Sector(s) Ext will be terminated at the failing sector.
Output parameters to the device
Sector Count Current The number of continuous sectors to be verified low order, bits (7:0).
Sector Count Previous The number of continuous sectors to be verified high order, bits (15:8). If zero is
specified in the Sector Count register, 65,536 sectors will be transferred.
Sector Number Current LBA (7:0)
Sector Number Previous LBA (31:24)
Cylinder Low Current LBA (15:8)
Cylinder Low Previous LBA (39:32)
Cylinder High Current LBA (23:16)
Cylinder High Previous LBA (47:40)
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 V V V V V V V V
Previous V V V V V V V V HOB=1 V V V V V V V V
Cylinder
Low
Current V V V V V V V V
Cylinder
Low
HOB=0 V V V V V V V V
Previous V V V V V V V V HOB=1 V V V V V V V V
Cylinder
High
Current V V V V V V V V Cylinder
High
HOB=0 V V V V V V V V
Previous V V V V V V V V HOB=1 V V V V V V V V
Device/Head 1 1 1 D - - - - Device/Head - - - - - - - -
Command 0 0 1 0 0 0 1 0 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
000V0V0 0 0V0V- 0- V
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