Hitachi IC25N040ATCS04-0 - Travelstar 40GN 40GB UDMA/100 4200RPM 2MB 2.5" IDE Hard Drive Specifications page 117

If an uncorrectable error occurs, the device will set BSY = 0 and ERR = 1, store the error status in the
Error Register, and interrupt the host. The registers will contain the location of the sector in error. The
error location will be reported with CHS mode or LBA mode. The mode is decided by the mode select bit
(bit 6) of the Device/Head register on issuing the command.
All data transfers to the host through the Data Register are 16 bits. The ECC bytes are an exception
having only 8 bits.
Hitachi Travelstar 60GH & 40GN hard disk drive specifications
104