Hitachi IC25N040ATCS04-0 - Travelstar 40GN 40GB UDMA/100 4200RPM 2MB 2.5" IDE Hard Drive Specifications page 159

Input parameters from the device
Sector Count
Sector Number
Cylinder High/Low
H
This is the number of requested sectors not verified. This number will be zero
unless an unrecoverable error occurs.
This is the sector number of the last transferred sector. (L = 0)
In LBA mode this register contains the current LBA bits 0–7. (L = 1)
This is the cylinder number of the last transferred sector. (L = 0)
In LBA mode this register contains the current LBA bits 8–15 (Low) and bits
16–23 (High). (L = 1)
This is the head number of the last transferred sector. (L = 0)
In LBA mode this register contains the current LBA bits 24–27. (L = 1)
Hitachi Travelstar 60GH & 40GN hard disk drive specifications
146