SCSI Format Unit Command

SCSI Format Unit Command

The SCSI Format Unit command is used to format a SCSI target device into LBAs. Defect management options can be specified in the CDB. This command can take a very long time to complete, typically one or more hours.

The CDB structure is:

The special parameter fields in the CDB have the following meaning:

*FmtData - Format Data - if this is one then the command is followed by two or three extra parameters:
**defect list header -
**initialization pattern descriptor -
**defect descriptors (optional) -

*CmpLst - Complete List:
**0 - the initiator will send a partial list of defects, to be added to the existing list
**1 - the initiator will send a complete list of defects, overwriting the existing list

*Defect list format - if the FmtData bit is one then this describes the defect options:
**000 - block format - 32-bit LBAs
**100 - bytes from index format - cylinder + head + byte-offset
**101 - physical sector format - cylinder + head + sector
**110 - vendor-specific

*Interleave -
**0000h - the target can use its default interleave
**0001h - consecutive LBAs must be contiguous
**all other values are vendor-specific


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