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
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