4 May
2000
4 May
'00
11:52 a.m.
On May 4, 16:55, Bill Pechter wrote:
> On May 4, 1:50, Chuck McManis wrote:
>
> > I tried to duplicate the bootable VMS 7.1 CD on my Sony CD-R drive
and
it
> > didn't work. (Using Adaptec EZ CD
creator's "Clone" facility) So I
> guessed
> > it was the block size issue.
I wrote:
> More likely just a format that EZ CD can't
read -- it understands
ISO-9660,
> RockRidge extensions, and Joliet extensions, but
I suspect the VMS CD
(like
> most Solaris, IRIX, etc) isn't ISO format.
If you have access to a
> unix/linux box, try reading it with 'dd' (that's how I copy Solaris,
Mac
> HFS, IRIX EFS/XFS, etc).
I believe the newest Adaptec EZ-CD can't do
non-ISO or Audio stuff...
I think that the Linux and Unix stuff can...
Bill
The unix software to write audio CDs normally does so from WAV or AIFF (or
AIFC) files; cdrecord, cdwrite, and WriteCD all do that. (Those are the
only basic writers I know of; software like xcdroast are just frontends to
one of the base writers, usually cdrecord). All of them also handle any
image file; you'd normally use mkisofs to create an ISO-9660 image file
containing whatever you want to write (mkisofs can also include RockRidge
or Joliet extensions, can build TRANS.TBL entries for MESSDOS, and can
create bootable CDs using El Torito); or use mkhybrid to create a hybrid
ISO/HFS filesystem readable on a Mac; or use software like mkefs to create
an IRIX bootable EFS CD.
To copy a data CD, rather than create an image from a bunch of files, the
easiest way is often to use dd. However, on a lot of systems, cdrecord
(and probably cdwrite) can read the CD directly via the O.S.
To copy an audio CD is more involved, mainly because it's impossible to
guarantee that you get exactly the right "sectors" in exactly the right
order from the original (a consequence of the way frames are labelled in
CD-DA format). Tools like cdparanoia solve that by reading overlapping
sections, and doing a lot of sliding comparisons to build up an accurate
copy (it creates a WAV file for every track). That's why simpler methods
often produce copies that don't sound exactly the same, though some CD-ROM
readers do a pretty good job at getting a clean audio stream, especially in
conjuction with software like readcdda or cdda2wav.
--
Pete Peter Turnbull
Dept. of Computer Science
University of York