Hitachi HTS548040M9AT00 Specifications page 195

LBA High/Mid
H
The drive internally uses 40 bytes of ECC on all data read or writes. The 4-byte mode of operation is provided via
an emulation technique. As a consequence of this emulation it is recommended that 40 byte ECC mode is used for
all tests to confirm the operation of the ECC hardware of the drive. Unexpected results may occur if such testing is
performed using 4-byte mode.
This indicates the cylinder number of the sector to be transferred. (L = 0)
In LBA mode this register contains current the LBA bits 8–15 (Mid) and bits 16–23
(High). (L = 1)
This indicates the head number of the sector to be transferred. (L = 0)
In LBA mode this register contains current the LBA bits 24–27. (L = 1)
Travelstar 5K80 Hard Disk Drive Specification
179