04-12-2008
Recover data from 2 files then combine
Using dd or similar tools to recover data from 2 damaged cdroms, I need a way to then combine the 2 files, 1 from each cd, and make a good file: this all result from finding that certain cd's tops scratch easily even when using the "proper" cd markers, hence making the file useless, however the back up copy is the same-I am going to assume that the damage to the files are in different "bits", and attempt to recover what i can. any ideas? files are 26megs, they were originally produced in corel drawing program. I can see the holes in the cd tops.
thanks in advance.
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File 1
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DD142 DD142_4A_1 NN-1 L_0_1
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DD142 DD142_4C_1 NN-3 L_2_1
DD142 DD142_3A_1 NN-41 L_3_1
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LEARN ABOUT DEBIAN
recoverdm
RECOVERDM(1) General Commands Manual RECOVERDM(1)
NAME
recoverdm - recover filesdisks with damaged sectors
SYNOPSIS
recoverdm -t type -i filedevicein -o fileout [-l list] [-n retries] [-s speed]
DESCRIPTION
recoverdm This program will help you recover disks with bad sectors. You can recover files as well complete devices. In case if finds sec-
tors which simply cannot be recoverd, it writes an empty sector to the output file and continues. If you're recovering a CD or a DVD and
the program cannot read the sector in "normal mode", then the program will try to read the sector in "RAW mode" (without error-checking
etc.). This toolkit also has a utility called 'mergebad': mergebad merges multiple images into one. This can be useful when you have, for
example, multiple CD's with the same data which are all damaged. In such case, you can then first use recoverdm to retrieve the data from
the damaged CD's into image-files and then combine them into one image with mergebad.
OPTIONS
-t type
is 1 for files, 10 for floppy disks and 40 for IDE disks (try -h for a complete list)
-i filedevicein
is the device or file you want to recover.
-o fileout
is the file where to write to. This file should not already exists.
-l list
This file will contain the offsets of the bad blocks as well as the size of the bad blocks. This file can be used together with the
image with the mergebad utility.
-n retries
Number of retries before going on with next sector, defaults to 6.
-r RAW read
Number of retries while reading in RAW mode before going on with next sector, default to 6.
-s rotation speed
Speed of the CD-ROMDVD, defaults to 1.
-h Gives the help message.
SEE ALSO
gddrescue(1), dd_rescue(1), testdisk(1), gpart(1)
AUTHOR
Folkert van Heusden <flok@xs4all.nl>,
Home page is <http://www.vanheusden.com/recoverdm/>
recoverdm Version 0.19 RECOVERDM(1)