6.4 Defect Management
C141-E104-03EN
6-13
(2) Alternate cylinder assignment
A defective sector is assigned to the spare sector in the alternate cylinder.
This processing is performed when the alternate assignment is specified in the
FORMAT TRACK command or when the automatic alternate processing is
performed at read error occurrence.
Figure 6.8 shows an example where (physical) sector 5 is detective on head 0 in
cylinder 0.
Notes:
1) 4 alternate cylinders are provided for each head in zone 14 (inner
side).
2) When an access request to physical 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.
Figure 6.8 Alternate cylinder assignment
(3) Automatic alternate assignment
The device performs the automatic alternate assignment when ECC correction
performance is increased during read error retry, a read error is recovered. 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.
1
2
3
4
5
6
7
505
506
1
2
3
4
5
6
7
505
506
(unused)
Index
Sector (Physical)
Sector (Logical)
Already
assigned
Defective sector is assigned to unassigned sector.
Cylinder 0
Head 0
Alternate
cylinder
Head 0
Defective
sector
Содержание DISK DRIVES MHL2300AT
Страница 1: ...C141 E104 03EN MHL2300AT MHM2200AT MHM2150AT MHM2100AT DISK DRIVES PRODUCT MANUAL ...
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Страница 40: ...3 1 Dimensions C141 E104 03EN 3 3 Figure 3 1 Dimensions MHM series 2 2 ...
Страница 52: ...3 4 Jumper Settings C141 E104 03EN 3 15 Figure 3 16 Example 2 of Cable Select drive drive ...
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Страница 185: ...Interface 5 108 C141 E104 03EN Figure 5 10 Data transfer timing ...
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