5.8.2.1FORMAT 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 5-16provides descriptions of the data fields in the Defect List Header

Table 5-15 .FORMAT UNIT Defect List Header-Data Format

Bit

7

6

5

4

 

3

2

1

0

Byte

 

 

 

 

 

 

 

 

 

 

0

 

 

 

Reserved

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

FOV

DPRY

DCRT

STPF

 

IP

DSP

Immed

VS

 

 

 

 

 

 

 

 

 

2-3

 

 

 

Defect List

Length

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 5-16FORMAT UNIT Defect List Header-Field Descriptions

 

 

 

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.

 

 

 

 

The Stop Format bit specifies the error conditions under which the drive is to terminate the

STPF

 

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

 

 

 

 

 

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-

IP

 

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.

 

 

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

Immed

 

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.

 

 

 

 

 

Gives the length in bytes of the Defect Descriptors that follow. A value of 0 is valid and

Defect List Length

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.

5-16 Maxtor Atlas 10K V