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Format Unit
DSP (Disable Saving Parameter). A DSP bit of one (1) specifies that the Target will not save
the MODE SELECT parameters.
VU {Vendor Unique}. This bit must be set to zero (0).
Defect List Length. This field specifies the total length in bytes of the defect descriptor that
follows. A sector number of FFFFFFFFH indicates that the entire track will be reallocated.
Defect Descriptor Format
Bit
Byte
7
1
6
I
1>
I
4,
I
3
I
2
I
1
J
0
00-02
(MSB=OO)
Cylinder Number Of Defect
(LSB=02)
03
Head Number Of Defect
04-07
(MSB=04)
Defect Bytes From Index Or Defective Sector Number
(LSB=07)
Each defect descriptor specifies the location of a defect. Each descriptor is comprised of the
cylinder number of the defect, the head number of the defect, and either the number of bytes
from index to the defect, or the defective sector number. The Target will reeturn CHECK
COMDITION if the defect descriptors are not in ascending order. The most significant part
of the address is the cylinder number. The least significant part of the address is either the
number of bytes from index to the defect, or the defective sector number, depending on the
format chosen. More than one block may be affected by each defect descriptor.
A defect bytes from index of defective sector number of FFFFFFFF(h) indicates that the
entire track will be reallocated.
A-10
SCSI Command Descriptions
DRAFT
1/18/93 09:58
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