Table 87 Dco Error Information Definition - Hitachi CinemaStar P7K500 Specifications

structure checksum is the two's complement of the sum of all byte in words 0 through 254 and the byte
consisting of bits 7:0 of word 255. Each byte is added with unsigned arithmetic, and overflow is ignored. The
sum of all bytes is zero when the checksum is correct.
Cylinder high
Cylinder low
Sector number
Sector count

Table 87 DCO error information definition

HITACHI Deskstar & CinemaStar P7K500 Hard Disk Drive specification (Rev 1.1)
invalid word location
invalid bit location (bits (15:8))
invalid bit location (bits (7:0))
error reason code & description
01h DCO feature is frozen
02h Device is now Security Locked mode
03h Device's feature is already modified with DCO
04h User attempt to disable any feature enabled
05h Device is now SET MAX Locked or Frozen mode
06h Protected area is now established
07h DCO is not supported
08h Subcommand code is invalid
FFh other reason
125