Hitachi HTS542525K9SA00 - Page 216

Deskstar 7K160 Hard Disk Drive Specification
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Cylinder High/Low 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)
H 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)