Input parameters from the device
Sector Count 
The number of requested sectors not transferred. This will be zero, unless an
unrecoverable 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)
Deskstar  60 GXP Hard disk drive specification
134