lphillips@lpami.wimsey.bc.ca (Larry Phillips) (08/26/90)
In <1199@tardis.Tymnet.COM>, jms@tardis.Tymnet.COM (Joe Smith) writes: >In article <1885@lpami.wimsey.bc.ca> lphillips@lpami.wimsey.bc.ca (Larry Phillips) writes: >>Well, it can (and should) be made compatible with existing data disks, as far >>as the file system format is concerned; that is, it can be made conformant to >>the High Sierra or ISO 9660 specs. > >Question: Does the CD-ROM file system look exactly like an AmigaDOS file >system, or is it just somewhat compatible? Well, depends on what you mean by the 'CD-ROM' file system. If you are referring to the High Sierra or ISO-9660 file system, then no, it does not look much like the Amigados file system. Bear in mind that a file system could be written to be Amigados file system compatible, and to do any necessary fiddling to make it work with the different block sizes of CD-ROM. >After seeing how Sun is distributing SunOS-4.1 on CD-ROM, I get the impression >that the standard for CD-ROMs have a different limitation in the length of >a file name, have a more restricted set of characters allowed in a file name, >and have a limitation on the number of periods in a file name. Also, the >standard format of CD-ROM for MS-DOS and Macintosh don't handle Unix >protection bits, much less the AmigaDOS protection bits. It looks like a file name may have up to 31 character, which may contain a file name, a file name extension, and a file version number. This means we may have two separators. I know, brain dead. I haven't looked at the ISO-9660 spec yet, so we can only hope someone saw fit to make this a little more versatile. >In other words, to store the contents of an entire Amiga floppy on CD-ROM and >preserve all the AmigaDOS attibutes requires using something like ZOO or >LHARC. Not all of the files in the current Fred Fish collection could be >stored on CD-ROM as simple files because some of the file names have illegal >characters. Both volume and file attributes are provided for. Again, an Amiga specific CD-ROM need not be in High Sierra or ISO-9660 format. -larry -- It is not possible to both understand and appreciate Intel CPUs. -D.Wolfskill +-----------------------------------------------------------------------+ | // Larry Phillips | | \X/ lphillips@lpami.wimsey.bc.ca -or- uunet!van-bc!lpami!lphillips | | COMPUSERVE: 76703,4322 -or- 76703.4322@compuserve.com | +-----------------------------------------------------------------------+
jms@tardis.Tymnet.COM (Joe Smith) (08/26/90)
In article <1885@lpami.wimsey.bc.ca> lphillips@lpami.wimsey.bc.ca (Larry Phillips) writes: >Well, it can (and should) be made compatible with existing data disks, as far >as the file system format is concerned; that is, it can be made conformant to >the High Sierra or ISO 9660 specs. Question: Does the CD-ROM file system look exactly like an AmigaDOS file system, or is it just somewhat compatible? After seeing how Sun is distributing SunOS-4.1 on CD-ROM, I get the impression that the standard for CD-ROMs have a different limitation in the length of a file name, have a more restricted set of characters allowed in a file name, and have a limitation on the number of periods in a file name. Also, the standard format of CD-ROM for MS-DOS and Macintosh don't handle Unix protection bits, much less the AmigaDOS protection bits. In other words, to store the contents of an entire Amiga floppy on CD-ROM and preserve all the AmigaDOS attibutes requires using something like ZOO or LHARC. Not all of the files in the current Fred Fish collection could be stored on CD-ROM as simple files because some of the file names have illegal characters. Could someone please post an overview of the current CD-ROM standards? At least, outline the differences between the High Sierra File System and AmigaDOS. -- Joe Smith (408)922-6220 | SMTP: jms@tardis.tymnet.com or jms@gemini.tymnet.com BT Tymnet Tech Services | UUCP: ...!{ames,pyramid}!oliveb!tymix!tardis!jms PO Box 49019, MS-C51 | BIX: smithjoe | 12 PDP-10s still running! "POPJ P," San Jose, CA 95161-9019 | humorous dislaimer: "My Amiga speaks for me."
R38@psuvm.psu.edu (Marc Rifkin) (08/31/90)
ISO 9660 is an internationally recognized format for CD-ROMs. It's architecture is different than AmigaDOS, as it is optimized for a non-writeable medium. To the Amiga, it is just another filesystem, like the old FS, FFS, MSDOS (if you've ever used Cross-Dos), etc. By using ISO 9660, the Amiga is at least filesystem compatible with most CD-ROMs- of course it can't run other computers' software, but the access to data files is there for Amiga native software to use. Marc Rifkin, R38@PSUVM