Deskstar T7K500 Hard Disk Drive Specification
187
12.24 Read Sector(s) Ext (24h)
Table 113: Read Sector(s) Ext command (24h)
The Read Sector(s) Ext command reads from 1 to 65,536 sectors of data from disk media and then transfers the
data from the device to the host.
The sectors are transferred through the Data Register 16 bits at a time.
If an uncorrectable error occurs, the read will be terminated at the failing sector.
Output parameters to the device
Sector Count Current The number of continuous sectors to be transferred low order, bits (7:0).
Sector Count Previous The number of continuous sectors to be transferred 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 1 0 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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