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CHAPTER 6
DISK MEDIA MANAGEMENT
6.1
Defect Management
6.2
Disk Media Initialization
6.3
Data Block Verification Methods (Recommended)
6.4
Alternate Block Allocation Processing
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.
6.1
Defect Management
(1)
Defect lists
Information on the positions of defects in the disk media are managed by the types of defect
list shown below. See the description of the FORMAT UNIT command (Section 3.3.1)
concerning methods for using the defect lists.
• P List
Defect position information at the point when the disk drive was 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 be used and alternate block processing be executed.
• D List
This list includes defect position information specified by the INIT in the
FORMAT UNIT command when initializing the disk media.
• C List
This list contains information on the positions of defective blocks 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.
• G List
This list is composed from the defective logical data block position 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.
The P List and G List are recorded in the system space on the disk media. The INIT can read
the contents of these lists by the READ DEFECT DATA command.
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