Hitachi T7K250 - Deskstar - Hard Drive Specifications page 170

Cylinder High/Low
H
The device internally uses 52 bytes of ECC data on all data written or read from the disk. The 4-byte mode of oper-
ation is provided via an emulation. Use of the 52 byte ECC mode is recommended for testing the effectiveness and
integrity of the ECC functions of the device.
In LBA mode, this register contains current LBA bits 0–7. (L = 1)
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)
This indicates the head number of the transferred sector. (L = 0)
In LBA mode, this register contains current LBA bits 24–27. (L = 1)
Deskstar T7K250 Hard Disk Drive Specification
156