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7.2 Disk Media Initialization
C141-C013 393
(2) Issuing the FORMAT UNIT command
Issue the FORMAT UNIT command and initialize the entire disk media surface.
In this FORMAT UNIT command, the entire disk media surface is initialized
using the P List, then after initialization, the data blocks are verified. If any
defective blocks are detected in the Verify operation, alternate blocks are
allocated for those data blocks. Also, the defect position information for only the
defective data blocks detected in the Verify operation is recorded in the G List.
The contents which need to be specified at this time are as follows.
a. CDB specification
Specify "0" in the "FmtData" bit and the "CmpLst" and "000" in the "Defect
List Format" field in the CDB.
b. FORMAT parameters
If the items values in the previous item are specified in the CDB, the Format
parameter is not necessary.
7.2.2 Re-initialization
The INIT can reinitialize the disk drive after it has been operated using the
FORMAT UNIT command.
If it is necessary after reinitialization to restore the data that were
stored on the disk media, it is necessary to save the data before
executing reinitialization, then execute data restore using system
software after reinitialization.
The INIT can change the size of the spare sector area and its location as well as
the number of logical data blocks before reinitialization. The recommended
procedure for reinitialization is shown below. However, in cases where the
logical data block length is changed, the initialization procedure described in
Section 7.2.1 must be followed during installation.
(1) MODE SELECT command
If the logical data block count (size of the User Space) or the size of the spare
sector area and its location are changed, issue the MODE SELECT EXTENDED
command and specify the disk media format attributes. The parameter
specification method is the same as in the case of initialization processing during
installation, described in Section 7.2.1. If the same format attributes as at present
will continue to be used, it is not necessary to issue the MODE SELECT
EXTENDED command.