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Full Discussion: Recover data from 2 files then combine
Top Forums UNIX for Dummies Questions & Answers Recover data from 2 files then combine Post 302187174 by era on Saturday 19th of April 2008 02:45:24 PM
Old 04-19-2008
Two is too little to be able to deduce which bits are correct -- you need more redundancy. Maybe you should have made three copies ...

If you have checksums or something then at least you could brute-force the bits you have to guess, but other than that (without knowledge of the Corel file format) it's pretty much trial and error.

Depends also on the type of error. My guess is your drive won't even let you read the sectors which are damaged, in which case you can use the noerror option of dd to continue reading. I guess it will leave zeros in those blocks, so then it should not be too hard to see if you get all the required pieces in either of the files.
Last edited by era; 04-19-2008 at 03:52 PM.. Reason: Afterthought: dd conv=noerror
 

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LEARN ABOUT DEBIAN

arbtt-recover

ARBTT-RECOVER(1)						Program references						  ARBTT-RECOVER(1)

NAME

       arbtt-recover - tries to recover a broken arbtt data log

SYNOPSIS

       arbtt-recover [OPTION...]

DESCRIPTION

       arbtt-recover tries to readsthe data samples recorded by arbtt-capture(1), skipping over possible broken entries. A fixed log file is
       written to <file>~/.arbtt/capture.log.recovered</file>. If the recovery was successful, you should stop arbtt-capture and move the file to
       <file>~/.arbtt/capture.log</file>.

       As a sid effect, arbtt-recover applies the log compression method implemented in version 0.4.5 to the samples created by an earlier
       version. If you have a large logfile written by older versions, running arbtt-recover is recommended.

OPTIONS

       -h, -?, --help
	   shows a short summary of the available options, and exists.

       -V, --version
	   shows the version number, and exists.

       -i, --infile
	   logfile to use instead of ~/.arbtt/capture.log

       -o, --outfile
	   where to save the recovered file, instead of ~/.arbtt/capture.log

FILES

       ~/.arbtt/capture.log
	   binary file, storing the arbtt data samples

       ~/.arbtt/capture.log.recovered
	   binary file, storing the fixed arbtt data samples

SEE ALSO

       See the arbtt manual for more information and the arbtt hackage page[1] for newer versions of arbtt.

AUTHORS

       Joachim Breitner <mail@joachim-breitner.de>
	   Main author of arbtt

       Sergey Astanin <s.astanin@gmail.com>
	   Contributor

       Martin Kiefel <mk@nopw.de>
	   Contributor

       Muharem Hrnjadovic <muharem@linux.com>
	   Contributor

NOTES

	1. arbtt hackage page
	   http://www.hackage.org/package/arbtt

arbtt manual							    04/07/2012							  ARBTT-RECOVER(1)
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