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Output Parameters To The Device
Sector Count
Sector Number
Cylinder High/Low
H
R
Input Parameters From The Device
Sector Count
Sector Number
Cylinder High/Low
H
The number of continuous sectors to be transferred. If zero is specified, then 256 sectors
will be transferred.
The sector number of the first sector to be transferred. (L=0)
In LBA mode, this register specifies LBA address bits 0-7 to be transferred. (L=1)
The cylinder number of the first sector to be transferred. (L=0)
In LBA mode, this register specifies LBA address bits 8-15 (Low) 16-23 (High) to be
transferred. (L=1)
The head number of the first sector to be transferred. (L=0)
In LBA mode, this register specifies LBA bits 24-27 to be transferred. (L=1)
The retry bit, but this bit is ignored.
The number of requested sectors not transferred. This will be zero, unless an
unrecoverable error occurs.
The sector number of the last transferred sector. (L=0)
In LBA mode, this register contains current LBA bits 0-7. (L=1)
The cylinder number of the last transferred sector. (L=0)
In LBA mode, this register contains current LBA bits 8-15 (Low), 16-23 (High). (L=1)
The head number of the sector to be transferred. (L=0)
In LBA mode, this register contains current LBA bits 24-27. (L=1)
Western Digital Hard Disk Drive OEM Specification
169
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