(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.
Index
Sector (physical)
1 | 2 | 3 | 4 | 5 | 6 |
Cylinder 0
Head 0
unused unused unused unused unused unused
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Cylinder 0 | 1 |
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Head 1 |
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| Cylinder 0 |
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| Head 0 | 2 | 3 | 4 | 5 | 6 |
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| Sector 1 |
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241 242 243
SP SP
unused unused unused
241 242 243
SP SP
Cylinder 0
Head 0
Sector 241
1 |
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| 5 | 161 | 162 |
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Track slip 0 |
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Head 0 |
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Cylinder 0 |
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Head 0 |
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Sector 1 |
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1 |
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Track slip 0 |
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Head 1 |
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Cylinder 0 |
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| Cylinder 0 | unused |
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Head 0 |
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Sector 163 |
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| Sector 241 |
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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.
6 - 12 |
