Technical information

HGST Ultrastar C15K600 Hard Disk Drive Specification
89
18.4
FORMAT UNIT (04)
Table 60 FORMAT UNIT
Byte
Bit
7
6
5
4
3
2
1
0
0
Command Code = 04h
1
FMTPINFO
LONG
LIST=0
FMTDATA CMPLIST Defect List Format
2
VU = 0
3-4
Obsolete = 0
5
VU = 0
Reserved = 0
FLAG
LINK
- 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
provided, 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: