Travelstar 80GN Hard Disk Drive Specification
104
Table 64: Device Configuration Overlay Data structure
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 0through 254 and the byte consist-
ing 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.
Table 65: DCO error information definition.
Word
Content
0
0001h
Data Structure revision
1
Multiword DMA modes supported
15-3
Reserved
2
1 = Multiword DMA mode 2 and below are supported
1
1 = Multiword DMA mode 1 and below are supported
0
1 = Multiword DMA mode 0 is supported
2
Ultra DMA modes supported
15-6
Reserved
5
1 = Ultra DMA mode 5 and below are supported
4
1 = Ultra DMA mode 4 and below are supported
3
1 = Ultra DMA mode 3 and below are supported
2
1 = Ultra DMA mode 2 and below are supported
1
1 = Ultra DMA mode 1 and below are supported
0
1 = Ultra DMA mode 0 is supported
3-6
Maximum LBA address
7
Command set/feature set supported
15-8
Reserved
7
1 = Host Protected Area feature set supported
6-4
Reserved
3
1 = Security feature set supported
2
1 = SMART error log supported
1
1 = SMART self-test supported
0
1 = SMART feature set supported
8-254
Reserved
255
Integrity word
See note below
15-8
Checksum
7-0
Signature (A5h)
LBA High
invalid word location
LBA Mid
invalid bit location (bits 7:0)
Sector count
error reason code & description (bits 15:8)
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
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