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Full Discussion: need help about dd in UNIX
Top Forums UNIX for Advanced & Expert Users need help about dd in UNIX Post 95444 by jim mcnamara on Wednesday 11th of January 2006 09:33:42 AM
Old 01-11-2006
Instead of writing to the output of dd to another tape, write it to disk, omitting bad blocks.

The reason is that if this is a text file, omitting a single block could turn several lines in the new file into meaningless garbage.

Sometimes cleaning or replacing the tape drive head will solve the problem of unreadable tape blocks.
 

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dds-dd(1)						      General Commands Manual							 dds-dd(1)

NAME
dds-dd - tool to read a dds device. SYNOPSIS
dds-dd [ -f device ] DESCRIPTION
dds-dd reads a dds tape devices (DAT). Every block is read and written to stdout. A tape with unknown block size or blocks of different size can be read. The default device is /dev/rmt0, which may be overridden with the environment variable TAPE, which in turn may be overridden with the -f device option. The device must be a character special file. OPTIONS
-f device Device of the tape archive (default is /dev/rmt0). Must be a character special file connected to a dds tape device. -V,--version Print the version number of mt-dds to stderr and exit immediately. --help print some screens of online help with examples through a pager and exit immediately. EXAMPLES
Example: Read the tape and make a listing: dds-dd | tar ft - Example: Read the tape and make a listing: dds-dd | cpio -it ENVIRONMENT
The environment variable TAPE overrides the default tape device /dev/rmt0. SEE ALSO dds2tar(1), dds2index(1), mt(1), tar(1) HISTORY
This program was created to use it in conjunction with dds2tar. AUTHOR
J"org Weule (weule@cs.uni-duesseldorf.de), Phone +49 211 751409. This software is available at ftp.uni-duesseldorf.de:/pub/unix/apollo 2.4 dds-dd(1)
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