HGST Ultrastar 7K4000 (SAS) Hard Disk Drive Specification
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18.4 FORMAT UNIT (04)
Table 42: FORMAT UNIT (04)
• FMTPINFO (Format Protection Information) in combination with the Protection Field Usage field in the Parameter
List Header specifies whether or not the drive enables or disables the use of protection information (see table defined
in the Parameter List Header section).
• FmtData set to one specifies that a Data Out phase follows the Command phase. The Data Out phase consists of a
Parameter List header, optionally followed by an Initialization Pattern Descriptor, optionally followed by a Defect
List. If FmtData=0, 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 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.
•Notes:It is recommended that the MODE SELECT command be issued prior to the FORMAT UNIT command to specify
parameters that affect the formatting process.
The Block Length parameter of the Mode Select Parameter List’s Block Descriptor is used during formatting and is
saved following a successful format operation. If a MODE SELECT command has not been issued since the last reset
or start-up (bring-up) sequence, then the Block Length from the previous format operation is used.
Subsequent to receiving a FORMAT UNIT command, the Target responds to commands as follows:
Byte BIT
7 6 543210
0 Command Code = 04h
1FMTPINFO
LONG
LIST=0
FMT-
DATA
CMPLIST Defect List Format
2VU = 0
3-4 Obsolete = 0
5 VU = 0 Reserved = 0 FLAG LINK
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