sed problem - replacement string should be same length as matching string. Post: 95405

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mbadblocks

mbadblocks(1) General Commands Manual mbadblocks(1)

Name
mbadblocks - tests a floppy disk, and marks the bad blocks in the FAT

Note of warning
This manpage has been automatically generated from mtools's texinfo documentation, and may not be entirely accurate or complete. See the
end of this man page for details.

Description
The mbadblocks command is used to mark some clusters on an MS-DOS filesystem bad. It has the following syntax:

mbadblocks [-s sectorlist|-c clusterlist|-w] drive:

If no command line flags are supplied, Mbadblocks scans an MS-DOS filesystem for bad blocks by simply trying to read them and flag them if
read fails. All blocks that are unused are scanned, and if detected bad are marked as such in the FAT.

This command is intended to be used right after mformat. It is not intended to salvage data from bad disks.

Command line options
c file
Use a list of bad clusters, rather than scanning for bad clusters itself.

s file
Use a list of bad sectors (counted from beginning of filesystem), rather than trying for bad clusters itself.

w Write a random pattern to each cluster, then read it back and flag cluster as bad if mismatch. Only free clusters are tested in such
a way, so any file data is preserved.

Bugs
Mbadblocks should (but doesn't yet :-( ) also try to salvage bad blocks which are in use by reading them repeatedly, and then mark them
bad.

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Need shell/sed script for grep+string replacement

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