SCSI Description
Quantum Atlas 10K II Ultra160/m SCSI Hard Disk Drives 5–27
FORMAT UNIT Command (04h) (continued)
5.10.1 Five 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 5-8 describes the
contents of the Grown Defect List after FORMAT UNIT command execution.
Table 5–8 FORMAT UNIT Command Supported Options
Defect List Contents of Grown Defect List after
FmtData CmpLst Length FORMAT UNIT Command Execution
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 Primary Defect List.
1 0 >0 The Grown Defect List contains:
•Original Grown Defect List.
•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 FORMAT UNIT
command.
1 1 >0 Same as the case above, except that the current Grown
Defect List is discarded before formatting begins.
5.10.2 FORMAT UNIT Parameter List
The FORMAT UNIT Parameter List (Figure 5-5) consists of a Defect List Header
(Figure 5-6) followed by one or more Defect Descriptors. Descriptors are either four
bytes or eight bytes in length.
Bit
Byte
7 6 5 4 3 2 1 0
0 - 3 Defect List Header
Initialization Pattern Descriptor (if any)
Defect Descriptors (if any)
Figure 5–5 FORMAT UNIT Parameter List — Data Format