Fujitsu MAY2036RC User Manual download pdf (Page 42)

Data Format

3-14 C141-E230

Type 2 (Reassignment of write fail sector)

1) Commands to be applied

- WRITE

- WRITE EXTENDED

- FORMAT UNIT

- WRITE at executing WRITE AND VERIFY

2) Application requirements / processing

When WRITE/WRITE EXTENDED command detects any Servo error (e.g. Write offtrack error)

and cannot be recovered within pre-determined retry number (specified in Mode Parameter). For

the sectors around defective Servo, alternate blocks are allocated and the data of this WRITE

commands are re-written.

Sectors to be made AWRE shall be following:

- the sector where the error occurs and the latter sectors and,

- the sectors whose data are logically continual and stored in Cache,

- the sectors which will be processed in this Write command and,

- the sectors which locate between erroneous Servo -1 and +1 (including Split sector)

This function is also applied for the sector that has already been re-assigned.

Remark:

When a write protection is prohibited through the setting terminal, the auto alternate block

allocation processing specification is disabled.

Automatic alternate block allocation is made up to the following

quantities during the execution of one command:

ARRE = Twice

AWRE (Type 1) = Eight times

AWRE (Type 2) = Maximum number which can be processed within

the recovery time limit

If more than the above mentioned defective block is detected, the

alternate block assignment processing for the first defective block is

executed but the alternate block assignment processing for the second

one is not executed and the command being executed terminates.

However, the initiator can recover the twice error by issuing the same

command again.

When an error is detected in a data block in the data area, recovery

data is rewritten and verified in automatic alternate block allocation

during the execution of the READ or READ EXTENDED command.

Alternate block allocation will not be made for the data block if

recovery is successful.

Example: Even if the data error which is recoverable by the WRITE

LONG command is simulated, automatic alternate block

allocation will not be made for the data block.

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 93 94

No comments

Fujitsu MAY2036RC User Manual Page 42