Aug 9, 2011

CD DVD Data Recovery Software Overview # Session I

Blank CDs and DVDs have been around for quite some time now and their limited life span means that many users will eventually run into accessibility problems. With age come problems to read files from the CDs or DVDs. The only option in this case is to make use of data recovery software to save those files to storage device before they become completely unrecoverable.
Why can files become unreadable on optical media? Burned CDs and DVDs suffer from material degradation. And most disks also suffer from oxidation, not to mention scratches and other forms of physical contacts. The average lifespan of such disks is said to be ten years.
This overview looks at free solutions to recover files from CDs and DVDs.
It should be obvious that data that is not there anymore physically cannot be read by even the best DVD or CD recovery software. Sometimes though files can not be read by the user in Windows, while they are largely recoverable on the byte level. Basically, data recovery software copies every readable byte of the optical disks to another storage device.
A. IsoBuster

What the developer says:
It supports all optical disc formats and all common optical disc file-systems. Start up IsoBuster, Insert a disc, select the drive (if not selected already) and let IsoBuster mount the media. IsoBuster immediately shows you all the tracks and sessions located on the media, combined with all file-systems that are present. This way you get easy access, just like explorer, to all the files and folders per file-system. Instead of being limited to one file-system that the OS picks for you, you have access to “the complete picture”. Access data from older sessions, access data that your OS (e.g. Windows) does not see or hides from you etc.
IsoBuster is available as a free and professional edition. The free version has several limitations, largely lack of HD DVD, Blu-Ray and file format support.
The program tries to install a toolbar during installation, make sure to cancel that before continuing. The program is simple to use. It will automatically recognize a CD or DVD that has been inserted into the drive. The sessions, tracks folders and files are displayed in the program interface.
Here it is possible to navigate the menu structure, and extract individual files or files from folders from the disk. IsoBuster displays a Save As dialog and extracts the data to the selected disk.
Several recovery options can be configured in the preferences. This includes the maximum number of retries, sorting criteria, file system specific settings or image files handlings. IsoBuster can load CD and DVD images as well, which is the recommended way of handling recoveries.

What the developer says:
CD Recovery Toolbox Free – repair damaged CD disks
CD Recovery Toolbox tool was developed for recovering damaged files from different disk types: CD, DVD,HD DVD, Blu-Ray, etc. You can use it to restore information lost as a result of some mechanical damage of the disk (scratches, chips, different spots on thesurface) or as a result of incorrect recording.
This program is very easy to use. CD Recovery Toolbox supports recovery of CD, DVD,HD DVD and Blu-Ray disks. It begins with the selection of the drive, and the output directory. The program then reads the files from the disk and displays them in a file browser.
Here it is possible to select the root folder, or one of the subfolders of the disk for recovery. A click on Save reads the data from the disk and saves it on the selected storage device.
What the developer says:
As your CD and DVD collection grows, there are two important problems you face – do your CDs and DVDs still work? What can you do when a CD or DVD starts to have problems? These are crucial questions since the discs are used to store valuable files like email, home movies, photographs, business/tax records and music. The solution is to use a free program like CDCheck. It can scan most CDs in a few minutes to tell you if the data is OK – this way, you don’t have to find out the hard way that there is a problem. Plus you can use the time it takes for a scan to complete as indicator of the CD or DVDs overall health – even though files may not be recorded as damaged, slower results normally indicate a CD that is on the way out (expect longer times if there are more files on the CD).
If a CD or DVD is showing files with damage or you can no longer read a file in a drive, CDCheck can be switched to recovery mode and make a full sweep of the CD or DVD, recovering lost files along the way. When parts of a file can’t be fully recovered, the program will still recover any salvageable fragments. Many file formats such as Zip, TIFF and JPEG can still be used if incomplete (success of this technique varies, depending on the damage). Most zip tools have a ‘repair archive’ function, and a standard graphics editor can help repair damage to photographs caused by missing fragments.
CD Check is a software that needs to be registered on the developer’s homepage before it is free to use for a lifetime. The program can check a disk for read errors, which the other programs in this overview cannot. The time of each check depends on the disk and the speed of the drive.
The other options are to compare directories, for instance a directory on the CD or DVD with a local directory, and to recover files from the disk. For comparison purposes, hashes are generated.


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