8.4 FORMAT UNIT (04h)
LINK
FLAG
Reserved = 0
VU = 0
5
(MSB)
Interleave Factor
(LSB)
3
4
VU = 0
2
Defect List Format
CmpList
FmtData
Reserved
1
Command Code = 04h
0
0
1
2
3
4
5
6
7
Bit
Byte
Figure 50. FORMAT UNIT (04h)
The FORMAT UNIT command performs a physical formatting of the drive media. This includes handling
defective sectors and overwriting all data areas with a constant data pattern. (Reserved areas of the
media are not affected by the FORMAT UNIT command.)
!
FmtData set to one specifies that a Data Out phase follows the Command phase. FmtData set to zero
specifies that no Data Out phase follows.
!
CmpList set to one specifies that the G-List (Grown Defect List) existing prior to the format not be
used and is discarded. The drive is formatted with P-List and D-List (if specified). D-List becomes the
new G-List.
Note: The drive manages two internal defect lists and one external. The primary defect list (“P”List) is
created at time of manufacture. The grown defect list (G-List) is built after manufacture by the
Initiators use of the REASSIGN BLOCK command and the Automatic Reallocate functions. The data
defect list (D-List) is an external list. It is supplied by the initiator in the DATA OUT phase of the
FORMAT UNIT command.
!
Defect List Format specifies the format of the defect descriptor transferred to the drive when
FmtData bit is set to one. The drive supports three defect descriptor formats for the Format Unit
command as following:
Format Description
000b Block format
100b Bytes From Index format
101b Physical Sector format
If the FmtData bit is set to zero, this field must also be zero. Otherwise the command will complete
with a CHECK CONDITION with a sense key of ILLEGAL REQUEST and an additional sense code of
INVALID FIELD in CDB.
!
Interleave Factor may be zero or one, either of which specifies an interleave of 1:1. Other Interleave
Factors are ignored because of the extensive buffering implemented in the drive.
Ultrastar 146Z10 hard disk drive specifications
51
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