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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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VIRECOVER(8)						    BSD System Manager's Manual 					      VIRECOVER(8)

NAME
virecover -- report recovered vi edit sessions SYNOPSIS
/usr/libexec/virecover DESCRIPTION
The virecover utility sends emails to users who have vi(1) recovery files. This email gives the name of the file that was saved for recovery and instructions for recovering most, if not all, of the changes to the file. This is done by using the -r option with vi(1). See the -r option in vi(1) for details. If the backup files have the execute bit set or are zero length, then they have not been modified, so virecover deletes them to clean up. virecover also removes recovery files that are corrupted, zero length, or do not have a corresponding backup file. virecover is normally run automatically at boot time using /etc/rc.d/virecover. FILES
/var/tmp/vi.recover/recover.* vi(1) recovery files /var/tmp/vi.recover/vi.* vi(1) editor backup files SEE ALSO
vi(1), rc.conf(5) HISTORY
This script, previously known as recover.script, is from nvi and was added to NetBSD in 1996. It was renamed in 2001. AUTHORS
This man page was written by Jeremy C. Reed <reed@reedmedia.net>. BSD
October 9, 2006 BSD
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