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- Newsgroups: rec.audio
- Path: sparky!uunet!sun-barr!cs.utexas.edu!torn!cunews!dgbt!serge
- From: serge@dgbt.doc.ca (Serge Ah Hee)
- Subject: Re: CD deterioration
- Message-ID: <1992Sep4.153851.18127@dgbt.doc.ca>
- Organization: The Communications Research Centre
- References: <1992Sep2.153652.13952@beaver.cs.washington.edu>
- Date: Fri, 4 Sep 92 15:38:51 GMT
- Lines: 47
-
- In article <1992Sep2.153652.13952@beaver.cs.washington.edu> pardo@cs.washington.edu (David Keppel) writes:
- >[Pardon if this is a FAQ; I looked and didn't see a FAQ list.]
- >
- >I have some CD's that are deteriorating, and I wonder what I can expect
- >for the rest of my collection.
- >
- >I generally write my name in indellible marker on disks, jewel boxes,
- >etc., so I can loan them out and think I have a better chance of
- >getting them back. I loaned a disk (Epic label, 1987 copyright) to a
- >friend who had skipping problems. I held the CD up to a lamp and
- >looked at the other side. Normally, litte light gets through a disk,
- >but where my name is written it seems that the metal in the middle of
- >the sandwich had disappeared along one edge of my writing, and the
- >light shines through brightly.
- >
- >Curious, I looked at a number of other CDs in my collection. All of
- >them have occasional bright spots, possibly manufacturing imperfections
- >and easily handled by the error correction equipment. One of the disks
- >(Kaleidoscope label, 1987 copyright) has too many imperfections to
- >count, probably on the order of a thousand. None of the imperfections
- >correspond to writing on the non-playing side, but this disk has
- >substantially more writing on it than the rest, as all four artists
- >signed the disk for me.
- >
- >I've heard that the Aluminum on older disks could deteriorate, but I
- >was under the impression that that happened only on some older disks,
- >manufactured pre-1985. I wonder if there are other sorts of expectable
- >deterioration, and what I can expect. Also, I note a direct
- >correlation between my writing and the disk's deterioration, in the
- >case of the Epic-label disk, so I'm wondering if anybody knows what
- >about my writing on this disk caused deterioration and why it's not
- >apparant on the other disks I looked at. It's a shame if my writing on
- >the disks -- so that I can keep my collection -- results in me losing
- >my collection, but I'm most concerned about avoiding future damage.
- >
- > ;-D on ( Lossy storage ) Pardo
-
- I think the alcohol in the marker might be the cause. I friend of mind
- got careless and spilled some cleaning alcohol on a cd. In a couple of minutes,
- holes started to appear. The plastic was fine, but the metallic layer was
- disappearing...
-
- --
- Serge Ah-Hee "Most troubles come from the fact that people
- serge@dgbt.doc.ca take for granted of what they have, and
- only care for what they want."
- My opinions are mine only.
-