
How many time have you lend your CD or DVD collections
for movies, pictures or application to your friends and when you got them back,
you discovered that they are badly damaged and beyond readable.
CD and DVD are fragile media. A few
scratches here and there and they can easily become unreadable. This blog post
present some of the tool that can allow recovering data from those spoilt
CD/DVD’s.
Recoverdm Toolkit - (recoverdm)
This program will help you recover disks
with bad sectors. In case if finds sectors which simply cannot be recovered,
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", meaning without error-checking etc.
ISO Image
An ISO image is an archive file (disk image) of an optical disc using a conventional ISO (International Organization for Standardization) format. The name “ISO” is taken from the ISO 9660 file system used with CD-ROM media, but an ISO image can also contain UDF file system.Data carving
According to Wikipedia "Carving, is the practice of searching an input for files or other kinds of objects based on content, rather than on metadata. File carving is a powerful tool for recovering files and fragments of files when directory entries are corrupt or missing, as may be the case with old files that have been deleted or when performing an analysis on damaged media.
Most file carvers operate by looking for file headers and/or footers, and then "carving out" the blocks between these two boundaries." In order to retrieve the files stored on our damaged media, we need a tool able to handle the ISO-9660 and/or UDF file system. At the time of writing of this blog post there is only few file carvers handling this file format. Dares is one of them.
Dares - (Windows - Linux)
Dares scans a CD/DVD image or a CD/DVD and
tries to find files. It does not depend on file system information, but instead
uses the Magic library to identify files. Doing it this way Dares can recover files even when
the file system (ISO-9660 or UDF) on the disc
is damaged and cannot be mounted anymore.
Case of study
In our case we have a heavily damaged DVD.
This DVD is supposed to be a backup of pictures but it can't be read anymore.
Let's see what we can restore.
Step 1 - Dumping the data
recoverdm -t 30 -i /dev/sr0 -o backupdvd.iso -s 1 -l badsectors.lst-r 1
Step 2 - Carving
dares –i backupdvd.iso –s outputdir

Step 3 - Renaming the files
Since we are looking for JPEG files we can rename all extracted file within the following command:
ls -d *.bin | sed 's/\(.*\).bin$/mv "&" "\1.jpg"/' | sh
Most cloud-based storage systems (data room providers comparison) perform automatic backup. This means that if you delete a file that you are working on from your home computer, you can easily access the file and recover it from a cloud server or a different device.
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