Optical Drive and Library SCSI-2 Command Reference

SCSI-2 Drive Command Set
Format Unit Command (04H)
Chapter 2 2-17
SCSI-2 Drive Commands
Format Unit Command Defect List
The Format Unit command Defect List consists of the Defect List Header
and zero or more multi-byte Defect Descriptor(s).
FOV A Format Options Valid bit of 1 indicates that the DCRT
(Disable Certification) and Immed (Immediate) fields
contain valid information.
A FOV bit of 0 indicates that the DCRT and Immed
fields do not contain valid information.
DCRT A Disable Certification bit of 1 indicates the drive does
not certify the optical disk during the format process.
A DCRT bit of 0 indicates that the drive certifies the
optical disk during the format process.
When the FOV bit is set to 0, the DCRT bit must also be
set to 0.
DCRT does not apply to Write-Once disks.
Immed When the Immediate bit is set to 1, it indicates a status
of GOOD is returned before the format operation is
begun.
An Immed bit of 0 indicates a GOOD status is returned
when the format is complete.
Defect List
Length The Defect List Length is the total length in bytes of the
Defect Descriptors that follow.
Table 2-11 Format Unit Defect List Header
Byte 7 6 5 4 3 2 1 0
0 Reserved (0)
1 FOV Rsvd
(0)
DCRT Reserved (0) Immed Rsvd
(0)
2 Defect List Length (MSByte)
3 Defect List Length (LSByte)