Deskstar 7K500 and Deskstar E7K500 Hard Disk Drive Specification
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Cylinder High/Low This indicates the cylinder number of the transferred sector. (L = 0)
In LBA mode, this register contains current LBA bits 8–15 (Low), 16–23 (High). (L = 1)
H This indicates the head number of the transferred sector. (L = 0)
In LBA mode, this register contains current LBA bits 24–27. (L = 1)