Hitachi HTS548040M9AT00 Specifications page 191

LBA Low
LBA High/Mid
H
This indicates 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 indicates the cylinder number of the last transferred sector. (L = 0)
In LBA mode this register contains the current LBA bits 8–15 (Mid) and bits 16–23
(High). (L = 1)
This indicates the head number of the last transferred sector. (L = 0)
LBA mode this register contains the current LBA bits 24–27. (L = 1)
Travelstar 5K80 Hard Disk Drive Specification
175