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6-10 C141-E120-02EN
75643210
(unused)
657 658 659
6586576566543210
Note: If an access request to logical sector 4 is specified, the device
accesses physical sector 5 instead of sector 4.
Figure 6.5 Sector slip processing
(2) Alternate cylinder assignment
A defective sector is assigned to the spare sector in the alternate cylinder.
This processing is performed when the alternate assignment is specified in the
FORMAT TRACK command or when the automatic alternate processing is
performed at read error occurrence.
Figure 6.8 shows an example where logical sector 4 is detective on head 0 in
cylinder 0.