ISO 9660 is a standard of the ISO, which defines the Filesystem used on CD-ROM. Its objectives are to support many operating systems like Windows or Mac OS, as well as the systems which allow the specification Unix. This filing system is also used on DVD-ROM.
Levels and restrictions
There are various levels with this standard:-
Level 1: The file names are restricted with 8 characters with an extension of 3 characters. The capital letters, numbers and underscores (underlined) can be used. The root can contain repertories which will have a maximum depth of 8 pennies repertories (root included). The standard Joliet makes it possible to go up to 64 characters.
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Level 2: The file names pass to 32 characters.
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Level 3: The files can be fragmented, with an aim of being able to use software like Direct-CD with CD engravers.
Image of disc
An image of CD using the filesystem ISO 9660 is a means of transferring the contents from the data track, in the shape of a file usually ending in “.iso”.It is also possible to create a complete image of a CD, all confused tracks. Under UNIX the software of copy dd in is able. Under Windows, there exist paying software (as Nero Burning Rom) which has this functionality - Nero creates a file with the format owner ending in “.nrg” - as well as free software, such InfraRecorder or CDBurnerXP Pro.
A file “.nrg” is thus larger than a file “.iso”. If the original CD is a CD-ROM (in other words: if the CD contains only one data track), it is preferable to create a file “.iso” for two reasons:
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to respect the standard, so that the file is readable by all (everyone does not use Nero, nor even Windows);
- to avoid the surplus of information useless.
Supported operating systems
Many systems allow the reading of the formatted discs ISO 9660, and of new versions also support Rock Ridge and Joliet. The operating systems which do not support these extensions function as if the CD-ROM were with the format ISO 9660 standard.
See too
- the standard El Torito , extension of the standard ISO 9660.
- No editor of ISO being appropriate to him, site SLAX offered, until the beginning of April 2007, 1000 $ with which would do one of them to him! The offer was withdrawn considering the person in charge of the site considered that nobody would reach…
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