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5-16 Maxtor Atlas 10K V
5.8.2.1 FORMAT UNIT Defect List Header
The FORMAT UNIT Defect List Header (Table 5-15) provides several optional
format control bits to give the initiator more control over the defect lists. Table 5-16
provides descriptions of the data fields in the Defect List Header
Table 5-15 .FORMAT UNIT Defect List Header-Data Format
Table 5-16 FORMAT UNIT Defect List Header-Field Descriptions
Bit
Byte
765 4 3210
0 Reserved
1 FOV DPRY DCRT STPF IP DSP Immed VS
2-3 Defect List Length
Name Description
FOV
The Format Options Valid bit indicates that the remaining option bits in this byte are valid.
If this bit is not set, the remaining bits, except Immed, are ignored.
DPRY
The Disable Primary bit specifies whether the drive should ignore the Primary Defect List
during the format to identify defective areas on the media. The drive's default is 0, indicating
that the drive should replace sectors found in the Primary Defect List during the format.
DCRT
The Disable Certification bit specifies whether the drive should certify the media during the
format. The drive’s default is 0, indicating that the drive should certify the media.
STPF
The Stop Format bit specifies the error conditions under which the drive is to terminate the
format. The state of the bit is ignored and the drive acts as if this bit is set. If either the Grown
Defect List or the Primary Defect List is not found, the format operation terminates with a
CHECK CONDITION status and a sense key of MEDIUM ERROR
IP
The Initialization Pattern bit signals the drive that the FORMAT UNIT Parameter List con-
tains initialization pattern information.
An Initialization Pattern bit of 1 indicates that an initialization pattern descriptor (Table 5-
17) is included in the FORMAT UNIT parameter list immediately following the Defect List
Header.
An Initialization Pattern bit of 0 indicates that an initialization pattern descriptor (Table 5-
17) is not included in the FORMAT UNIT parameter list, and the drive will use its default
initialization pattern of all zeros.
DSP
The Disable Saving Parameter prohibits the drive from preserving MODE SELECT param-
eters received while the Format is in progress. This bit is ignored, and the drive acts as if it
were set.
Immed
When the Immediate bit is 0, the drive returns a status after the format operation completes.
If the disconnect privilege is granted in the accompanying IDENTIFY message, the drive dis-
connects from the bus after fetching and validating the Command Descriptor Block and the
FORMAT UNIT Parameter List. If the disconnect privilege is not granted, the drive stays
connected to the bus during the entire FORMAT UNIT command. When the Immediate bit
is set to 1, the drive returns a status after the Command Descriptor Block and FORMAT
UNIT Parameter List have been fetched and validated. In this case, the drive ignores the
IDENTIFY message's disconnect privilege bit and remains connected to the bus while it val-
idates the Command Descriptor Block and Parameter List. It returns the completion status
before it disconnects. The drive then proceeds with the format.
VS Vendor-specific. Must be 0.
Defect List Length
Gives the length in bytes of the Defect Descriptors that follow. A value of 0 is valid and
means that no Defect Descriptors follow. A CHECK CONDITION status is returned if this
value is not a multiple of the defect descriptor size. The Defect List Length is equal to four
times the number of defect descriptors if Block format is used, or eight times if Bytes From
Index format or Physical Sector format is used.