Product manual

3.4.4.4 Defect descriptor—physical sector format
Defects are specified in the physical sector format when the defect list
format field is 101
B.
See Byte 1 of the Format Unit command in Sec-
tion 3.4.4. on page 39.
Each defect descriptor for the physical sector format specifies a sector-
size defect location that is composed of the cylinder number of the defect,
the head number of the defect and the defect sector number. The defect
descriptors must be in ascending order.
A defect sector number of FFFFFFFF
H
(which means reassign the entire
track) is illegal.
The information in the following table is for each defect.
Bytes
Bits
76543210
0–2 Cylinder number of defect
3 Head number of defect
4–7 Defect sector number
3.4.5 Reassign Blocks command (07
H
)
When the drive receives the Reassign Blocks command, it reassigns
defective logical blocks to available spare sectors.
Note.
ARRE and AWRE may perform automatic reassignments inde-
pendently of this command.
After sending the Reassign Blocks command, the initiator transfers a
defect list containing the logical block addresses to be reassigned. The
drive reassigns the logical blocks. The data contained in the logical
blocks may not be preserved.
The drive can repeatedly assign a logical block to multiple physical
addresses until there are no more spare locations available on the disc.
If the drive does not have enough spare sectors to reassign all of the
defective logical blocks, the command terminates with a check condition
status, and the sense key is set to media error. The logical block address
of the first logical block not reassigned is returned in the information bytes
of the sense data.
Medalist Pro 2160N/2160WC Product Manual, Rev. A 43