HOW TO RECoVERY YOUR CD

frist step you visit http://www.dvdisaster.net/en/download.html

The dvdisaster project:
Optical media (CD,DVD,BD) keep their data only for a finite time (typically for many years). After that time, data loss develops slowly with read errors growing from the outer media region towards the inside.
Archival with data loss protection
dvdisaster stores data on CD/DVD/BD (supported media) in a way that it is fully recoverable even after some read errors have developed. This enables you to rescue the complete data to a new medium.
Data loss is prevented by using error correcting codes. Error correction data is either added to the medium or kept in separate error correction files. dvdisaster works at the image level so that the recovery does not depend on the file system of the medium. The maximum error correction capacity is user-selectable.
Common misunderstandings about dvdisaster:
  • dvdisaster can not make defective media readable again. Contents of a defective medium can not be recovered without the error correction data.

  • Such functions are outside the scope of dvdisaster's internal design and goals.
Examples of the error correction...
Typical applications
dvdisaster is a complex tool which would require a whole book to cover all of its features. Since we are currently lacking the resources for doing a book (and you might be short on reading time also) we will take a different approach here. First we will demonstrate how the different functions of dvdisaster work together. Then we will describe common tasks and provide step by step instructions for solving them. In most cases following these steps will be all you need to do. At the end of each instruction set a discussion of further configuration options is included for advanced users.
Symbols used in this document
Working with dvdisaster requires certain combinations of optical media, media images and error correction data. Check out the following symbols to find out what you will need for the respective tasks:
Medium (a CD for example)
These symbols indicate whether processing a medium is part of the respective task, and if the medium needs be completely error free or may already be damaged.
good medium (no read errors)
bad medium (with read errors)

Medium image (ISO image of a medium stored on the hard disk)
Some functions do not work directly with the medium, but with an ISO image on hard disk instead. Depending on the condition of the respective medium the image may be complete or incomplete.
complete image (made from good medium)
incomplete image (made from bad medium)

Error correction data
Recovering media images by using error correction data is the key feature of dvdisaster. This symbol shows whether error correction data is required.
Medium containing error correction data
Separate error correction file



Hardware requirements
  • x86, PowerPC or Sparc processor;
  • an up-to-date CD/DVD/BD drive with ATAPI, SATA or SCSI interface;
  • enough hard disk space for creating .iso images from processed media.
Supported operating systems
The following table gives an overview of the supported operating systems. The specified releases have been used for developing and testing the current dvdisaster version. Typically, slightly older and newer OS versions will also work.
The dvdisaster project recommends GNU/Linux.
Operating System
Release
32bit support
64bit support
GNU/Linux
Debian Squeeze (6.0.2)
Kernel 2.6.32
yes
yes
FreeBSD1)
8.0
yes
yes
NetBSD
5.02
yes
yes
Mac OS X
10.6 (Snow Leopard)
yes
no2)
Windows4)
Windows 2000 SP43)
yes
no2)
1)FreeBSD: using ATAPI drives requires loading the atapicam kernel module -- see INSTALL doc
2)64bit Support not planned.
3)Later Versions up to Windows 7 have been reported to work. Windows 2000 SP3 and earlier versions are not supported.
4)Support for multicore processors varies. On some editions using additional cores for dvdisaster does not result in more performance.

Download dvdisaster
dvdisaster is available for recent versions of the FreeBSD, GNU/Linux, Mac OS X(Darwin), NetBSD and Windows operating systems. It is provided as free Software under the GNU General Public License v2.
Please download either the source code or a binary version from the list below. A digital signature is provided for verification that the packets are in their original state.
  • The source code version contains a file INSTALL with further instructions for compiling it.
  • For Mac OS X a ZIP archive is provided which is installed by unpacking it into an arbitrary place. Please note the special hints for Mac OS X.
  • To install the binary version for Windows please execute the downloaded program and follow the dialog.
Alpha (unstable) versions - new and experimental for experienced users!
Testers are welcome for the upcoming dvdisaster release, but should be aware of remaining bugs and incompatibilities. The current unstable release is 0.79 (devel-3).
Stable version - recommended for getting started.
Most important changes in this version:
  • Support for Blu-Ray media
  • "Raw" reading and C2 scans for CD media
  • Selectable number of reading attempts
  • First native Mac OS X application bundle
  • NetBSD-Port by Sergey Svishchev
  • Improved media type recognition
  • Info window describing inserted medium
  • Improved and enhanced preferences dialog
  • Reworked and enhanced documentation
  • Russian translations by Igor Gorbounov
  • ... and many more small changes and fixes.

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