Fujitsu MHN2100AT Manual Do Utilizador

C141-E120-02EN

6-11

Notes:

1)

4 alternate cylinders are provided for each head in zone 14 (inner
side).

2)

When an access request to logical sector 4 is specified, the device
accesses the alternated sector in the alternate cylinder instead of
sector 4.  When an access request to sectors next to logical sector 5
is specified, the device seeks to cylinder 0, head 0, and continues the
processing.

(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.

An unrecoverable write error occurs during write error retry, automatic alternate
assignment is performed.

After read command which involves read data from the disk medium is
completed, the read-ahead cache function reads the subsequent data blocks
automatically and stores the data to the data buffer.

0

1

2

3

4

5

6

658

659

0

1

2

3

4

5

6

658

659

(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