Sometimes it happens that the adverse factors, or a mistake by a user could compromise the integrity of the data. The failed programs and bug could corrupt the file system or file allocation table, it can happen that the hard drive fails. For these reasons it is essential to save the most important information on several different devices: optical media, external hard disks, memory sticks.

Where now the horse has fled, there remains the hope of recovering the data with the auxiliary tools.

Retrieving images

The best program to retrieve images (JPEG format for storing digital photos) and Digital Photo Recovery. The use of this software is simple and the results are excellent because this is specialized in the restoration of photographs. You can use to read memory cards which have been erased, or to scan a hard disk even if the images were finally erased.

Recovering deleted data files and other

To retrieve data and files deleted by mistake and no longer present in the trash the operating system you can use or Ontrack Easy Recovery Stellar Phoenix. This program is a fee. The trial version will search and show which files can be restored, while the recovery must buy the license.

For Linux you can use Recover (http://recover.sourceforge.net/linux/recover) or FindFile (http://www.vanheusden.com/findfile/).

Recover Partitions

Sometimes it happens that the partitions are no longer accessible for various reasons, including hard drive failure or programs that corrupt the filesystem or the table where there are the addresses of the file. In the case of hardware problems, you can try to make a clone of the disk connected as slave. Start a computer with its hard disk and copy files using tools like dd or similar.

Using the Knoppix Linux distribution programs are available: dd, dd_rescue, TestDisk (http://www.cgsecurity.org/wiki/TestDisk) and PhotoRec (http://www.cgsecurity.org/wiki/PhotoRec).

Although you can use dd, it is better to use another program that saves time because the first instrument is quite slow.

Download ddrescue (if not present) from: http://ftp.gnu.org/gnu/ddrescue/

Extract the files:

tar xjf ddrescue-1.6.tar.bz2

Navigate to the folder you just created:

cd ddrescue-1.6

Run the file to configure and compile:

. / configure & & make

To examine the possible files to recover and create a log:

. / ddrescue-n / dev / old_disk / dev / new_disk rescued.log

To retrieve data:

. / ddrescue-r 1 / dev / old_disk / dev / new_disk rescued.log

To fix corrupted filesystem you can use TestDisk which is capable of recovering lost partitions Format: BSD disklabel, ext2 and ext3, Linux RAID md 0.9/1.0/1.1/1.2, Linux Swap, LVM and LVM2, NTFS, ReiserFS 3.5, 3.6 and 4, FAT12, FAT16 and FAT32.

TestDisk (also available for both Windows and Linux) is able to solve problems with image files like those used by QEMU. To operate on one of these:

testdisk / home / user / immagine.img

When even with these tools are unable to recall you can turn to a professional data recovery company like Vogon or Ontrack.

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