Photorec Data Recovery for Win

(Credit: cgsecurity)

PhotoRec is file data recovery software designed to recover lost files including video, documents and archives from hard disks, CD-ROMs, and lost pictures (thus the Photo Recovery name) from digital camera memory.

PhotoRec ignores the file system and goes after the underlying data, so it will still work even if your media's file system has been severely damaged or reformatted.

PhotoRec is free - this open source multi-platform application is distributed under GNU General Public License. PhotoRec is a companion program to TestDisk, an app for recovering lost partitions on a wide variety of file systems and making non-bootable disks bootable again. 

For more safety, PhotoRec uses read-only access to handle the drive or memory card you are about to recover lost data from. Important: As soon as a pic or file is accidentally deleted, or you discover any missing, do NOT save any more pics or files to that memory device or hard disk drive; otherwise you may overwrite your lost data. This means that while using PhotoRec, you must not choose to write the recovered files to the same partition they were stored on.

PhotoRec runs under

• DOS/Win9x
• Windows NT 4/2000/XP/2003/Vista/2008/7
• Linux
• FreeBSD, NetBSD, OpenBSD
• Sun Solaris
• Mac OS X

File systems

Photorec ignores the file system, this way it works even if the file system is severely damaged.
It can recover lost files at least from

• FAT,
• NTFS,
• EXT2/EXT3 filesystem
• HFS+

ReiserFS includes some special optimizations centered around tails, a name for files and end portions of files that are smaller than a filesystem block. In order to increase performance, ReiserFS is able to store files inside the b*tree leaf nodes themselves, rather than storing the data somewhere else on the disk and pointing to it. Unfortunately, PhotoRec isn't able to deal with this - that's why it doesn't work well with ReiserFS.

Media

PhotoRec works with hard disks, CD-ROMs, memory cards (Compact Flash, Memory Stick, SecureDigital/SD, SmartMedia, Microdrive, MMC, etc.), USB memory drives, DD raw image, EnCase E01 image, etc.
PhotoRec has been successfully tested with various portable media players including iPod and the following Digital Cameras:

• Canon EOS300D, 10D
• Casio Exilim EX-Z 750
• HP PhotoSmart 620, 850, 935
• Nikon CoolPix 775, 950, 5700
• Olympus C350N, C860L, Mju 400 Digital, Stylus 300
• Sony Alpha DSLR, DSC-P9
• Pentax K20D
• Praktica DCZ-3.4

Known file formats

PhotoRec searches for known file headers. If there is no data fragmentation, which is often the case, it can recover the whole file. Photorec recognises numerous file formats including ZIP, Office, PDF, HTML, JPEG and various graphics file formats. The whole list of file formats recovered by PhotoRec contains more than 390 file extensions (about 225 file families). 

Source: cgsecurity