[Courses] [FS] Lesson 1

Random random832 at rcbooks.org
Mon Jul 14 05:11:54 EST 2003


On Monday, Jul 14, 2003, at 03:22 America/Indianapolis, Conor Daly 
wrote:

> On Tue, Jul 08, 2003 at 04:51:42PM +0100 or thereabouts, gaga wrote:
>>
>>> Pretty much any writeable media (with the exception of CDR(W)
>>
>> How sure are you about that ? Cause i remember having CD's that had 2
>> partitions, one for pc's, one for apple's...
>>
>> Could it be a different kind of partitions ?
>
> These will be "sessions" on the CD.  They're similar to partitions but 
> not
> the same in that you can select (and therefore mount) only one session 
> at a
> time.  On a "multisession" CD, there will be more than one session but 
> these
> will be visible to the system as a single filesystem.

 From what I remember, the HFS-Hybrid CD's worked differently from 
multisession discs, and there's also no particular reason you can only 
mount one at a time, if you use cdfs (presents each session as an ISO) 
with loopback, you can mount them separately. For that matter, Mac OS 
X, if you hold option while inserting the disc, it will mount each 
session as a different partition. a "normal" driver will mount all 
sessions one on top of the other, not one at a time.

Back to hybrid discs - I believe they were set up in such a way as for 
the HFS part to be invisible to normal ISO-9660 drivers, and would only 
be visible to a driver that knew specifically about it (either a mac, 
or mounting the cd with -t hfs under linux, or using cdfs)

note on cdfs: this is a fs on linux (i believe it's a patch; not sure) 
which will mount a cd as a folder containing ISO's for each session, an 
image of any HFS hybrid partition, and i think also .cda of each audio 
track.

Disclaimer: all this information should be taken with the consideration 
of the fact that i know nothing.



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