Infant mortality and longevity of DVD media?
trixter at oldskool.org
Sat Oct 6 14:16:11 CDT 2007
Ethan Dicks wrote:
> When writing DVDs, I always do a read-verify right after burning, and
> for archival data, I tend to create recovery data with programs like
> par2, and burn two to three copies. If it's worth my time to archive,
> it's worth spending $1 for more than one copy.
This is exactly my procedure as well, but I use QuickPar instead of
par2. I also burn two copies, since high-quality DVD-Rs can be had for
less than $0.50 in bulk.
My typical process is to use Winrar with a recovery record (parity) of
1%, then take the resulting files and use Quickpar to generate as much
parity as necessary to fill up the DVD-R. I then burn, ***and I make
sure that the DVD-R also has a copy of winrar and quickpar on the
disc*** (just in case 20 years from now someone is trying to extract my
stuff and doesn't know what a *.par file is).
> As I said, I lost a file once. That was with CD-Rs, and that was the
> first one out of many hundreds of discs burned (presuming they
> verified at write-time in the first place). I _have_ had a number of
> discs that didn't verify, and that could be due to a number of causes,
> from defective media to "cosmic rays". I have not, however, with that
> one previously mentioned exception, lost data (yet?) from disks that
> did verify.
Yes, that's been my experience as well. If they're going to be bad,
they're usually bad right out of the gate (ie. didn't pass Verify).
Every year, I take my very first burnt CDR from 1995 out and try to read
it. It has always read. I keep my CDRs and DVDRs in a cool dry dark
place, though; not everyone can store them in optimal conditions.
Jim Leonard (trixter at oldskool.org) http://www.oldskool.org/
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