Table 104 Dco Error Information Definition - Western Digital Ultrastar DC HC310 Specifications

Note.
Bits 7:0 of this word contain the value A5h. Bits 15:8 of this word contain the data structure checksum. The data
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 invalid word location
Cylinder low invalid bit location (bits (15:8))
Sector number invalid bit location (bits (7:0))
Sector count error reason code & description
01h
02h
03h
04h
05h
06h
07h
08h
FFh

Table 104 DCO error information definition

DCO feature is frozen
Device is now Security Locked mode
Device's feature is already modified with DCO
User attempt to disable any feature enabled
Device is now SET MAX Locked or Frozen mode
Protected area is now established
DCO is not supported
Subcommand code is invalid
other reason
Western Digital Hard Disk Drive OEM Specification
129