54 lines
2.1 KiB
Plaintext
54 lines
2.1 KiB
Plaintext
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Some thoughts on Joliet - why it is a dumb idea to have a CD
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with Joliet enhancements but without Rock Ridge.
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It also helps you to understand why it it not possible to append
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a new session to a multi-session Joliet CD when Rock Ridge is
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missing.
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- Joliet is not an accepted independant international standard
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like ISO-9660 or Rock Ridge (IEEE-P1282).
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Joliet has been created in 1995 - Rock Ridge in 1990.
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Rock Ridge became a IEEE standard around 1992.
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Joliet is an unjustified addition to ISO-9660.
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- The Joliet tree has no relation to the
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ISO-9660 tree. Files from the ISO-9660 tree and from the
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Joliet tree only share content. In general, it is not
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possible to find the ISO-9660 name from a Joliet name
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and vice versa if you check both trees on a CD.
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Rock Ridge extensions are located at the end of each
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ISO-9660 directory record. This makes the Rock Ridge
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tree closely coupled to the ISO-9660 tree.
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- Joliet does not allow all characters too, so the
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Joliet filenames are not identical to the filenames
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on disk.
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As the ISO-9660 tree is the standard reference tree
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on a CD and the ISO-9660 filenames don't allow all
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characters and there is a length limitation, the
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ISO-9660 names cannot be mapped to the filenames on the
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OS reference tree on disk for doing multi-session.
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Due to different limitations, the short ISO-9660 name
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is in most cases not equal to the Joliet name or the
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Rock Ridge name.
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- Joliet has a filename length limitation of 64 chars (independent
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from the character coding and type e.g. European vs. Japanese)
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This is annoying as modern filesystems all allow 255 chars
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per path name component.
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Joliet uses UTF-16 coding while Rock Ridge uses ISO-8859 or
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UTF-16 based chars and allows 255 octets. Using UTF-8,
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Rock Ridge allows 85 Japanese characers or 255 US-ASCII chars.
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Other than slightly longer filenames, Joliet offers no new properties
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over plain ISO 9660. Rock Ridge is an open extendable standard and
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there is no filesystem property on Win32 that could not be implemented
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using Rock Ridge.
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Except Linux and FreeBSD, there is no POSIX-like like OS that supports
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Joliet. Never create Joliet only CD's for that reason.
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