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Дата изменения: Sun May 4 15:24:36 1997
Дата индексирования: Mon Oct 1 22:44:50 2012
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Checking for disk errors with badblocks

It can be a good idea to periodically check for bad blocks. This is done with the badblocks  command. It outputs a list of the numbers of all bad blocks it can find. This list can be fed to fsck  to be recorded in the filesystem data structures so that the operating system won't try to use the bad blocks for storing data. The following example will show how this could be done.

$ badblocks /dev/fd0H1440 1440 > bad-blocks
$ fsck -t ext2 -l bad-blocks /dev/fd0H1440
Parallelizing fsck version 0.5a (5-Apr-94)
e2fsck 0.5a, 5-Apr-94 for EXT2 FS 0.5, 94/03/10
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Check reference counts.
Pass 5: Checking group summary information.

/dev/fd0H1440: ***** FILE SYSTEM WAS MODIFIED *****
/dev/fd0H1440: 11/360 files, 63/1440 blocks
$

If badblocks reports a block that was already used, e2fsck  will try to move the block to another place. If the block was really bad, not just marginal, the contents of the file may be corrupted.