3-12
C141-E205
Figure 3.7
Alternate block allocation by FORMAT UNIT command
During FORMAT UNIT command, alternate block allocation is conducted in following cases:
1) Unrecovered write offtrack condition during a media write
2) Uncorrectable Data Error during a media read (certification) *1
If above errors are detected during FORMAT UNIT command, the IDD allocates the alternate
block(s) to the defective data blocks. Reassign procedure itself is the same as one in REASSIGN
BLOCKS command.
*1. Certification is permitted when DCRT flag is cleared (DCRT flag=0) in FORMAT UNIT
command.
The IDD checks all initialized logical data blocks by reading them out after the above
alternate block allocation is made to initialize (format) the disk.
: Unused spare sector
: Defective sector
: n represents a logical data block number
Summary of Contents for MAU3036NC
Page 1: ...C141 E205 01EN MAU3147NC NP MAU3073NC NP MAU3036NC NP DISK DRIVES PRODUCT MAINTENANCE MANUAL ...
Page 10: ...This page is intentionally left blank ...
Page 26: ...This page is intentionally left blank ...
Page 34: ...This page is intentionally left blank ...
Page 50: ...This page is intentionally left blank ...
Page 96: ...This page is intentionally left blank ...
Page 122: ...This page is intentionally left blank ...
Page 126: ...This page is intentionally left blank ...
Page 128: ...This page is intentionally left blankw ...
Page 129: ......
Page 130: ......