1Some thoughts on Joliet - why it is a dumb idea to have a CD 2with Joliet enhancements but without Rock Ridge. 3It also helps you to understand why it it not possible to append 4a new session to a multi-session Joliet CD when Rock Ridge is 5missing. 6 7- Joliet is not an accepted independant international standard 8 like ISO-9660 or Rock Ridge (IEEE-P1282). 9 Joliet has been created in 1995 - Rock Ridge in 1990. 10 Rock Ridge became a IEEE standard around 1992. 11 12Joliet is an unjustified addition to ISO-9660. 13 14- The Joliet tree has no relation to the 15 ISO-9660 tree. Files from the ISO-9660 tree and from the 16 Joliet tree only share content. In general, it is not 17 possible to find the ISO-9660 name from a Joliet name 18 and vice versa if you check both trees on a CD. 19 20 Rock Ridge extensions are located at the end of each 21 ISO-9660 directory record. This makes the Rock Ridge 22 tree closely coupled to the ISO-9660 tree. 23 24- Joliet does not allow all characters too, so the 25 Joliet filenames are not identical to the filenames 26 on disk. 27 28 As the ISO-9660 tree is the standard reference tree 29 on a CD and the ISO-9660 filenames don't allow all 30 characters and there is a length limitation, the 31 ISO-9660 names cannot be mapped to the filenames on the 32 OS reference tree on disk for doing multi-session. 33 34 Due to different limitations, the short ISO-9660 name 35 is in most cases not equal to the Joliet name or the 36 Rock Ridge name. 37 38- Joliet has a filename length limitation of 64 chars (independent 39 from the character coding and type e.g. European vs. Japanese) 40 This is annoying as modern filesystems all allow 255 chars 41 per path name component. 42 43 Joliet uses UTF-16 coding while Rock Ridge uses ISO-8859 or 44 UTF-16 based chars and allows 255 octets. Using UTF-8, 45 Rock Ridge allows 85 Japanese characers or 255 US-ASCII chars. 46 47Other than slightly longer filenames, Joliet offers no new properties 48over plain ISO 9660. Rock Ridge is an open extendable standard and 49there is no filesystem property on Win32 that could not be implemented 50using Rock Ridge. 51 52Except Linux and FreeBSD, there is no POSIX-like like OS that supports 53Joliet. Never create Joliet only CD's for that reason. 54