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CHAPTER 6 Disk Media Management
6.1
6.2
6.3
6.4
In this chapter, disk media defect management methods, treatment methods for
media defects which occur during operation, reinitialization procedures and other
disk media management methods are discussed. Furthermore, see Chapter 3,
"Data Format" in the "Product Manual" concerning details of the data recording
format on the disk media.
6.1 Defect Management
(1) Defect lists
Information on the positions of defects in the disk media is managed by the types
of defect list shown below. See the description of the FORMAT UNIT command
(Section 4.3.1) concerning methods for using the defect lists.
•
P List Defect position information at the point when the disk drive was
•
D List This list includes defect position information specified by the INIT in
•
C List This list contains information on the positions of defective blocks
•
G List This list is composed from the defective logical data block position
C141-C012
Defect Management
Disk Media Initialization
Data Block Verification Methods (Recommended)
Alternate Block Allocation Processing
shipped from the factory is recorded in this list. The defective
portions included in this list are permanent defects, and when the disk
media is initialized, it is necessary that this list is used and alternate
block processing is executed.
the FORMAT UNIT command when initializing the disk media.
detected during the data block Verify operation (Certification) after
initialization by the FORMAT UNIT command. This information is
generated internally by the IDD when the FORMAT UNIT command
is executed.
information specified by the INIT in the REASSIGN BLOCKS
command, defective logical data block position information from
alternate blocks which have been allocated by the IDD's auto alternate
block allocation processing, information specified as the D List and
information generated as the C List.
6-1
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