Format Unit (04); Table 32. Format Unit (04) - Hitachi HUS151473VL3800 - Ultrastar 73.4 GB Hard Drive Specifications

17.4 FORMAT UNIT (04)

Table 32: FORMAT UNIT (04)
Byte
0
1
2
3 (MSB)
4
5
The FORMAT command performs a physical formatting of the drive media. This includes handling of defective sectors and
the overwriting of all data areas with a constant data pattern. (Reserved areas of the media are not affected by the FORMAT
command.)
• FmtData set to one specifies that a Data Out phase follows the Command phase. The Data Out phase consists of a defect
list header followed by zero or more defect descriptors, the Glist. FmtData set to zero specifies that no Data Out
phase follows. If no Defect List Header is supplied, the following defaults are assumed: DPRY=0, DCRT=1,
STPF=1, IP=0, DSP=0, Immed=0.
• CmpLst
• - set to one specifies that the Grown Defect List (GList) existing prior to the issuance of the Format Unit command
be discarded. If provided, the DList then becomes the GList. Following these operations, the Drive will be formatted
with the PList and GList.
• - set to zero specifies that the GList existing prior to the issuance of the Format Unit command is retained. If pro-
vided, the DList is combined with the GList to become the new GList. Following these operations, the Drive will be
formatted with the PList and GList.
Note: The drive manages two internal defect lists and one external. The Plist is created at time of manufacture. The Glist is
built after manufacture by the Initiators' use of the REASSIGN BLOCK command and the Automatic Reallocate functions.
The Dlist 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 Target when FmtData bit is set to one.
The Target supports the following three defect descriptor formats for the FORMAT UNIT command:
Format Description
000b
100b
101b
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.
7 6 5
Reserved = 0
VU = 0
Block format
Bytes From Index format
Physical Sector format
Hitachi Ultrastar 15K147 SCSI Hard Disk Drive Specification
BIT
4 3
Command Code = 04h
FmtData CmpLst
VU = 0
Interleave Factor
Reserved = 0
62
2 1 0
Defect List Format
(LSB)
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