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Optical disc
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=== File systems === File systems specifically created for optical discs are [[ISO9660]] and the [[Universal Disk Format]] (UDF). ISO9660 can be extended using the "Joliet" extension to store longer file names than standalone ISO9660. The "Rock Ridge" extension can store even longer file names and Unix/Linux-style file permissions, but is not recognized by Windows and by DVD players and similar devices that can read data discs. For [[cross-platform]] compatibility, multiple file systems can co-exist on one disc and reference the same files.<ref>[http://www.osta.org/specs/pdf/udf260.pdf UDF 2.60 specification]: 6.11.4 UDF Bridge format.</ref><ref>[http://www.osta.org/specs/pdf/udf102.pdf UDF 1.02 specification]: 6.9 Requirements for DVD-ROM</ref>
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