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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
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
Table 104 DCO Error Information Definition
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Western Digital Ultrastar DC HC310 SATA Product Manual