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C141-E056-02EN 6 - 13
Before automatic alternate assignment, the device performs rewriting the corrected data to
the erred sector and rereading. If no error occurs at rereading, the automatic alternate
assignment is not performed.
2) When a write error occurs and the error does not recovered.
Figure 6.9 shows an example where (physical) sector 5 is automatic alternated on head 0 in
cylinder 0.
5 76431 3002992
Index
Cylinder 0
Head 0
Head 0
Already
assigned
Defective
sector
4 alternate cylinders are provided for each head in zone 13 (inner side).
When an access request to sector 5 is specified, the device accesses the alternated sector in the
alternate cylinder instead of sector 5. When an access request to sectors next to sector 5 is
specified, the device seeks to cylinder 0, head 0, and continues the processing.
Defective sector is assigned to unassigned sector.
(unused)
Sector (logical)
Sector (physical)
Alternate
cylinder
21 43 6 7
299298
Figure 6.9 Automatic Alternate assignment
242 243
1 alternate cylinder is provided in outer side.
299 300
SPSP
242
243