Dvdisaster
Encyclopedia
dvdisaster is a computer program
aimed to enhance data survivability on optical disc
s by creating error detection and correction
data, which is used for data recovery
. This program can be used either to generate Error-Correcting Code (ECC) data from an existing media or to augment an ISO image
with ECC data prior to being written onto a medium. dvdisaster is free software
available under the GNU General Public License
.
The two modes of ECC data generation in dvdisaster make use of Reed–Solomon codes
. In RS01 mode, the generated data is created from a disc image and is stored in a separate file, which must be written on some other medium. Alternatively, in RS02 mode, the ECC data is appended to the end of the disc image before the image is burned
to disc.
dvdisaster can be helpful to recover the contents of a damaged disc even when no ECC data is available. The entire disc can be read into an image, skipping damaged parts. dvdisaster can then repeatedly rescan just the missing parts until all damaged areas have been filled in by correct data.
Computer program
A computer program is a sequence of instructions written to perform a specified task with a computer. A computer requires programs to function, typically executing the program's instructions in a central processor. The program has an executable form that the computer can use directly to execute...
aimed to enhance data survivability on optical disc
Optical disc
In computing and optical disc recording technologies, an optical disc is a flat, usually circular disc which encodes binary data in the form of pits and lands on a special material on one of its flat surfaces...
s by creating error detection and correction
Error detection and correction
In information theory and coding theory with applications in computer science and telecommunication, error detection and correction or error control are techniques that enable reliable delivery of digital data over unreliable communication channels...
data, which is used for data recovery
Data recovery
Data recovery is the process of salvaging data from damaged, failed, corrupted, or inaccessible secondary storage media when it cannot be accessed normally. Often the data are being salvaged from storage media such as internal or external hard disk drives, solid-state drives , USB flash drive,...
. This program can be used either to generate Error-Correcting Code (ECC) data from an existing media or to augment an ISO image
ISO image
An ISO image is an archive file of an optical disc, composed of the data contents of every written sector of an optical disc, including the optical disc file system...
with ECC data prior to being written onto a medium. dvdisaster is free software
Free software
Free software, software libre or libre software is software that can be used, studied, and modified without restriction, and which can be copied and redistributed in modified or unmodified form either without restriction, or with restrictions that only ensure that further recipients can also do...
available under the GNU General Public License
GNU General Public License
The GNU General Public License is the most widely used free software license, originally written by Richard Stallman for the GNU Project....
.
Recovery modes
When an optical disc is physically damaged (such as by scratching), or has begun to deteriorate, some parts of the data on the disc may become unreadable. By utilizing the ECC data previously generated by dvdisaster, damaged parts of the disc data can be recovered.The two modes of ECC data generation in dvdisaster make use of Reed–Solomon codes
Reed–Solomon error correction
In coding theory, Reed–Solomon codes are non-binary cyclic error-correcting codes invented by Irving S. Reed and Gustave Solomon. They described a systematic way of building codes that could detect and correct multiple random symbol errors...
. In RS01 mode, the generated data is created from a disc image and is stored in a separate file, which must be written on some other medium. Alternatively, in RS02 mode, the ECC data is appended to the end of the disc image before the image is burned
Optical disc authoring
Optical disc authoring, including DVD and Blu-ray Disc authoring , is the process of assembling source material—video, audio or other data—into the proper logical volume format to then be recorded onto an optical disc .-Process:To burn an optical disc, one usually first creates an...
to disc.
dvdisaster can be helpful to recover the contents of a damaged disc even when no ECC data is available. The entire disc can be read into an image, skipping damaged parts. dvdisaster can then repeatedly rescan just the missing parts until all damaged areas have been filled in by correct data.
See also
- Data recoveryData recoveryData recovery is the process of salvaging data from damaged, failed, corrupted, or inaccessible secondary storage media when it cannot be accessed normally. Often the data are being salvaged from storage media such as internal or external hard disk drives, solid-state drives , USB flash drive,...
- Error detection and correctionError detection and correctionIn information theory and coding theory with applications in computer science and telecommunication, error detection and correction or error control are techniques that enable reliable delivery of digital data over unreliable communication channels...
- Optical disc authoringOptical disc authoringOptical disc authoring, including DVD and Blu-ray Disc authoring , is the process of assembling source material—video, audio or other data—into the proper logical volume format to then be recorded onto an optical disc .-Process:To burn an optical disc, one usually first creates an...
- Reed–Solomon error correctionReed–Solomon error correctionIn coding theory, Reed–Solomon codes are non-binary cyclic error-correcting codes invented by Irving S. Reed and Gustave Solomon. They described a systematic way of building codes that could detect and correct multiple random symbol errors...
- ParchiveParchiveParchive is an open source software project that emerged in 2001 to develop a parity file format, as conceived by Tobias Rieper and Stefan Wehlus...
- List of data recovery software