26 Oct
2006
26 Oct
'06
11:04 a.m.
On Thu, 2006-10-26 08:03:44 -0500, Jules Richardson <julesrichardsonuk at
yahoo.co.uk> wrote:
Seth J. Morabito wrote:
For a pure data CD, an ISO image is probably good enough. (Though you
may want to additionally get hold of all the TOC/ATIP information
that's not inside the ISO image.)
For anything else (CD+G, CDI, ...) you need to understand how a CD
works and at which layer this type of CD is operating.
Especially for "copy-protected" CDs, which may contain premastered
broken sectors, you probably also want to get hold of the C2 level
error bits.
Does anyone have any guidelines about making
archival images of
CD-ROM media? For years, I've been using dd on Solaris or Linux
to dump the raw bytes of CD-ROMs, and cdrecord if I want to make
a copy from the raw image, but I don't know if this is considered
"good enough" to preserve all the associated filesystem and partition
structures of the disc. It has been for me, so far, but I'd like to
hear other opinions on the matter. How do you archive CD-ROM images?
Hmm, won't most tools create an ISO filesystem image from a CD? I would
expect that's good enough in nearly all cases, although possibly not for
things like games consoles where I believe the original media's screwed
around with as an anti-piracy measure. Personally I find that I only ever use a few percent
of the commercial
software on a CD, though - e.g. I'll just install the app but not all the
bundled junk that comes with it. Saving an archive image means you get
everything, warts and all. For a true archive you should save everything,
but if it's really just for personal use I'd be tempted to just save what
you think you'll need.
I started to write some helper library to "easily" access SCSI devices
(to which virtually all CD drives belong, even those that are
connected to an IDE cable for transport.) That one can read images
that contain most of all available information, but that's far from
being production-ready...
MfG, JBG
--
Jan-Benedict Glaw jbglaw at lug-owl.de +49-172-7608481
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