utility makes a file to contain a bad sector.
Normally, bad sectors
are made inaccessible by the standard formatter, which provides
a forwarding table for bad sectors to the driver.
If a driver supports the bad blocking standard it is much preferable to
use that method to isolate bad blocks, since the bad block forwarding
makes the pack appear perfect, and such packs can then be copied with
The technique used by this program is also less general than
bad block forwarding, as
cannot make amends for
bad blocks in the i-list of file systems or in swap areas.
On some disks,
adding a sector which is suddenly bad to the bad sector table
currently requires the running of the standard
Thus to deal with a newly bad block
or on disks where the drivers
do not support the bad-blocking standard
may be used to good effect.
utility is used on a quiet file system in the following way:
First mount the file system, and change to its root directory.
Make a directory
giving as argument the
directory followed by
all the bad sectors you wish to add.
(The sector numbers must be relative to the beginning of
the file system, but this is not hard as the system reports
relative sector numbers in its console error messages.)
Then change back to the root directory, unmount the file system
on the file system.
The bad sectors should show up in two files
or in the bad sector files and the free list.
remove files containing the offending bad sectors, but
have it remove the
This will leave the bad sectors in only the
utility works by giving the specified sector numbers in a
creating an illegal file whose first block address is the block containing
bad sector and whose name is the bad sector number.
When it is discovered by
it will ask
"HOLD BAD BLOCK ?".
A positive response will cause
to convert the inode to a regular file containing the bad block.