6.3 Defect Management
6.3 Defect Management
Defective sectors of which the medium defect location is registered in the system space are replaced with spare sectors in the formatting at the factory shipment.
All the user space area are formatted at shipment from the factory based on the default parameters listed in Table 6.1.
6.3.1 Spare area
Following two types of spare area are provided for every physical head.
1)Spare cylinder for sector slip:
used for alternating defective sectors at formatting in shipment
2)Spare cylinder for alternative assignment:
used for automatic alternative assignment at read error occurrence.
6.3.2Alternating defective sectors
The two alternating methods described below are available:
(1) Sector slip processing
A defective sector is not used and is skipped and a logical sector address is assigned to the subsequent normal sector (physically adjacent sector to the defective sector).
When defective sector is present, the sector slip processing is performed in the formatting.
Figure 6.7 shows an example where physical sector 4 is defective on head 0 in cylinder 0.
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