> Jerome Fine wrote:
>
>Is there any way to check a CD?
The obvious way is to duplicate it to
an "image copy" on HD. If the copying
app manages to read all the sectors,
then it must be OK. For simple ISO9660
CDs, simply copying off the data may be
enough.
There are also programs (such as CDcheck,
http://www.elpros.si/CDCheck/) which will
test out your CDs for you.
> Also, how often do you recommend making
> a new copy?
Once, just before the old one goes bad :-)
Seriously, I've not actively gone back through
my stuff to check, but I have dragged stuff off CD
a few years after burning and so far I've only
hit one bad CD. And even that one may have been
burned badly - these days I do a check against
the source when writing a CD. It was that bad CD
that made me start doing that!
For *important* stuff, consider
making two copies.
OTOH, five years from now you will be
moving your CD-R (and CD) stuff
over to whatever the next high capacity
media happens to be (C3D,
http://www.c-3d.net/tech_frameset.html,
with 125*G*B per recordable disk,
looks to be adequate ...)
> Also, can CD software duplicate (make an exact copy of a) CDs?
CDRWin
http://www.goldenhawk.com/ and
CloneCD
http://www.elby.org/ can both do this
and both have free demo versions. There
are plenty of others (I just don't
remember which have freebie versions).
If your CDs have some for of copy
protection, then things may not be so
straightforward.
>And can anyone suggest a way to do the
>following on a W98 (Yeck) system:
>
>I want to set up some files in both ISO file structure
>(available under DOS/W95/W98)
>and under RT-11 as an RT-11 partition.
>Is there a way to copy the files to a specific
>block on the CD?
Tim Shoppa's RT-11 CD is set up this way (IIRC).
I don't know how he did it, but it's clearly possible.
The trick for this kind of stuff is usually to have
the non-ISO9660 filesystem set up to use the bits
of the CD not used by the ISO9660 system. For details
on how to do this for OpenVMS's ODS-2
see
http://www.tmesis.com/cdrom/.
If you want to have the ISO9660 and ODS-2
filesystems share (some or all of) the same
data (i.e. you want maybe 600MB of data
visible to each fs) then see:
http://support.tditx.com/~odsiso/index.html.
Neither of these do exactly what you want,
but they illustrate the general principle.
Antonio
Received on Tue Feb 05 2002 - 19:33:28 GMT