5.8.1Five Forms of FORMAT UNIT Commands

Five different forms of the FORMAT UNIT command are supported through different combinations of the Format Data bit, Complete List bit, and the information in the Defect List Length field. (Refer to FORMAT UNIT Defect Header List for a description of the Defect List Length field.) The different command forms give the initiator control over the contents of the Grown Defect List. Table 5-13describes the contents of the Grown Defect List after FORMAT UNIT command execution.

Table 5-13FORMAT UNIT Command Supported Options

 

 

Defect

Contents of Grown Defect List after FORMAT UNIT

FmtDat

CmpLst

List

Command Execution

 

 

Length

 

 

 

 

 

 

 

0

0

N/A

All sectors found to be bad, but not listed in the Primary Defect List or

Grown Defect List, are added to the Grown Defect List.

 

 

 

1

0

0

Same as above.

 

 

 

 

1

1

0

The existing Grown Defect List is discarded. A new Grown Defect List is

generated, containing All sectors found to be bad, but not listed in the Pri-

 

 

 

mary Defect List.

 

 

 

The Grown Defect List contains:

 

 

 

Original Grown Defect List

1

0

>0

All sectors found to be bad, but not listed in the Primary Defect List.

A list of sectors supplied by the initiator. These sectors are passed in defect

 

 

 

 

 

 

descriptors in the data-out buffer transfer that occurs as part of the FOR-

 

 

 

MAT UNIT command.

1

1

>0

Same as the case above, except that the current Grown Defect List is dis-

carded before formatting begins.

 

 

 

5.8.2FORMAT UNIT Parameter List

The FORMAT UNIT Parameter List (Table 5-14)consists of a Defect List Header (Table 5-15)followed by one or more Defect Descriptors. Descriptors are either four bytes or eight bytes in length.

Table 5-14FORMAT UNIT Parameter List-Data Format

Bit

7

6

5

 

4

3

 

2

1

0

Byte

 

 

 

 

 

 

 

 

 

 

 

 

0 - 3

 

 

 

 

Defect List

Header

 

 

 

 

 

 

 

 

 

 

 

 

 

Initialization Pattern Descriptor (if any)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Defect Descriptors (if any)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Maxtor Atlas 10K V

5-15