FUJITSU MPC3065AH User Manual
Page 172
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
7
6
4
3
1
300
299
2
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
2
1
4
3
6
7
299
298
Figure 6.9
Automatic Alternate assignment
242
243
1 alternate cylinder is provided in outer side.
299
300
SP
SP
242
243