FUJITSU MPC3065AH - Manual (Page 171)

C141-E056-02EN 6 - 12
(2) Track slip processing
Track slip processing is the method that ensures all the sectors contained in a physical track in
track slip area. The processing is performed when a physical track contains three or more
defective sectors. But automatic alternation assignment is not performed after shipment.
Track slip area is set to the most inner Zone 14, and the same number sectors as that in a
physical track containing defective sectors are used in track slip area (spare sectors are not
included).
Figure 6.8 shows an example that cylinder 0, head 0 is at track slip processsing.
unused unused unused unused unused unused unused unused unused
Head 0
SP SP
243 242 241 6 5 4 3 2 1
Cylinder 0
Sector (physical)
Index
Head 0
Head 1
SP SP
243 242 241 6 5 4 3 2 1
Track slip 0
6 5 4 3 2
Cylinder 0
Head 0
Sector 1
Cylinder 0
Cylinder 0
Head 0
Sector 241
162 161 5 4 3 2 1
Cylinder 0
Head 0
Sector 1
Head 1
Track slip 0
162 161 82 81 1
unused Cylinder 0
Head 0
Sector 241 Cylinder 0
Head 0
Sector 163
Figure 6.8 Track slip processing
(3) Automatic alternate assignment
The device performs the automatic assignment at following case.
1) When ECC correction performance is increased during read error retry, a read error is
recovered.