IBM DTTA-351010 - Deskstar 10.1 GB Hard Drive Specifications page 170

H The head number of the first sector to be transferred. ( L = 0 )
In LBA mode, this register contains LBA bits 24 - 27. ( L = 1 )
R The retry bit. If set to one, then retries are disabled. But ignored, when write cache is
enabled. (Ignoring the retry bit is in violation of ATA-2.)
Input Parameters From The Device
Sector Count The number of requested sectors not transferred. This will be zero, unless an unre-
coverable error occurs.
Sector Number The sector number of the last transferred sector. ( L = 0 )
In LBA mode, this register contains current LBA bits 0 - 7. ( L = 1 )
Cylinder High/Low 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 )
H The head number of the last transferred sector. ( L = 0 )
In LBA mode, this register contains current LBA bits 24 - 27. ( L = 1 )
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O E M Specifications for DTTA-3xxxxx