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C141-E056-02EN6 - 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.
unusedunusedunusedunusedunusedunusedunusedunused unused
Head 0
SPSP
243242241654321
Cylinder 0
Sector (physical)
Index
Head 0
Head 1
SPSP
243242241654321
Track slip 0
65432
Cylinder 0
Head 0
Sector 1
Cylinder 0
Cylinder 0
Head 0
Sector 241
16216154321
Cylinder 0
Head 0
Sector 1
Head 1
Track slip 0
16216182811
unusedCylinder 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.