In responding to Stephen Davies question, as well as, everyone else's input:
DVD has yet to be completely standardised by the industry. How a DVD was
produced, even one year ago, has changed in some fashion by the introduction
of newer recording methods.
Rather than give you a URL to any particular site, do your own search on DVD
standards with google, and you will find technological "WOR" stories going
on. For example, did you know until last year there was no question of
standardization of the commercial media to be used in DVD recordings, or the
machines it would be recorded on. DVD-R was decided as the commercial
format, because it has a write once ability (Copyright?). DVD-RAM could be
rerecorded. Since then DVD-RW was developed for private recordings, because
it provides economical rerecording on the same media. A year ago the forum
on DVD technology (and the major manufacturers) all scrambled for a personal
standard on DVD. However, to add to the confusion, DVD-R+ and DVD-RW+ was
introduced, and with it in additional questions on compatibility.
For everyone of the list, here is an example of a compatibility issue:
DVD-RW will not play at all on DVD-R players! DVD-R will play on only "some"
of the DVD-RW players (but not all)!
Taking this all into consideration, what DVD format is released by a
distributor (studio), or what compatibility issues exist for the player that
the Patron has at home are going to ultimately have conflicts. These are
represented by the concerns you are having over the shelf life a DVD
recording. Every Library should be aware of this situation before investing
To: Multiple recipients of list <email@example.com>
Subject: extending DVD & CD Life Span
Date: Fri, 7 Feb 2003 14:11:07 -0800 (PST)
In the local second hand shops, the owners will spray "Pledge" or
some kind or aerosol wax onto a disk to mask defects and allow it to play
more smoothly. Obviously, it can't rectify skips, but it helps with disks
which are so badly scratched that they just stop in the player.
Currently we have a $100 CD set ruined because of bad scratching.
Does anyone know if this practice works? Could it be bad for the machine
which plays it?
Mount Royal College, Calgary
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