HP C2488A Technical Reference Manual page 135

Manage Primary
Defect Descriptor. Bytes from Index Format
Bit
Byte
7
I
6
I
5
I
4
I
3
I
2
I
1
I
0
00-02
(MSB=OO) Cylinder Nwnber Of Defect (LSB=02)
03
Head Number Of Defect
04-07
(MSB=04) Defect Bytes From Index (LSB=07)
Each defect descriptor for the Bytes from Index Format specifies the beginning of an 8-byte
defect location on the media. Each defect descriptor contains the cylinder, head, and the
offset in bytes from index of the defect.
The defect descriptors within a defect list will be sorted in ascending order as follows:
• Primary Key: cylinder
• Secondary Key: head number
• Tertiary Key: bytes from index
More than one physical or logical block may be relocated by each defect descriptor.
Defect Descriptor· Physical Sector Format
Bit
Byte
7
I
6
I
5
I
4
I
3
I
2
I
1
I
0
00-02
(MSB=OO)
Cylinder Number Of Defect (LSB=02)
03
Head Number Of Defect
04-07 (MSB=04) Defective Sector Number (LSB=07)
Each physical sector defect descriptor specifies the location of a defect that is the length of
a sector. Each defect descriptor contains the cylinder, head, and the sector location of the
defect.
The defect descriptors within a defect list will be sorted in ascending order as follows:
• Primary Key: cylinder
• Secondary Key: head number
• Tertiary Key: sector number
More than one physical or logical block may be relocated by each defect descriptor.
A defective sector number of FFFFFFFFH indicates that the entire track is considered
defective.
'DRAFT
vendor Unique Command Descriptions B·15
1/18/93 09:58