From: owner-basia-digest@smoe.org (basia-digest) To: basia-digest@smoe.org Subject: basia-digest V8 #188 Reply-To: basia@smoe.org Sender: owner-basia-digest@smoe.org Errors-To: owner-basia-digest@smoe.org Precedence: bulk X-To-Unsubscribe: Send mail to "basia-digest-request@smoe.org" X-To-Unsubscribe: with "unsubscribe" as the body. basia-digest Friday, November 28 2003 Volume 08 : Number 188 Today's Subjects: ----------------- CDs [Lipman_Larry ] Re: CDs ["JC" ] ---------------------------------------------------------------------- Date: Thu, 27 Nov 2003 18:25:39 -0600 From: Lipman_Larry Subject: CDs Happy Thanksgiving all! CDs don't really "wear out" as vinyl did. However, there has been some discussion of "laser rot" whereby the repeated "heat" of the laser might deform the pits and lands which reflect the laser light and create the pattern of "1s" and "0s" that are translated into audio. There has also been some discussion of mold creeping into the "pancake" of layers in discs not manufactured properly, though I haven't heard of either in a long, long, long time. Discs made in a factory are fairly safe for archival purposes, and I believe home-burn CDs should last 50 years if handled properly. (NARAS and AES can accurately answer those questions for sure.) What is likely happening is that the abrasion from sliding the CD across the jewel case/player load edge/etc is causing damage. I've also had some home-burn CDs rendered into coasters because the "business" ("silver") layer stuck to the inside of a non-tyvek sleeve. LL At 12:15 AM 11/26/2003, you wrote: From: "JC" ...I just bought a duplicate set of Basia cds because a couple of mine are showing signs of extreme wear. Whoever said cds don't wear out was incorrect... jan ------------------------------ Date: Thu, 27 Nov 2003 18:12:11 -0700 From: "JC" Subject: Re: CDs Good info - thanks! What my one cd is doing strangely I attribute to overuse (because sometimes when my cats are all falling asleep to it I hate to let the music stop and wake them up) from setting my cd player to infinite "Repeat" of the entire cd. It did not do this before it had been played about a half-billion times, give or take. It doesn't act this way every single time, but nearly every time I play this particular cd. I have only had this happen to me once before in my life, years ago, on an entirely different cd player, with a different cd, and it began happening after similar overuse of the cd; it doesn't seem to matter if the machine is cold or warmed up, and it begins only doing this rarely as I continue playing the cd. After a few more whiles of playing the cd (days or weeks or months, no pattern that I can tell yet) it works up to doing it every single time I play the cd. Here's what happens: when I turn the player on and press the "play" button (or if the player is already on I just press the "play" button), it will act like it's going to begin playing, go thru the motions of displaying the entire length of the cd in hrs/mins/seconds, reset itself to "0" as it it were preparing to begin measuring the length of the first track as it plays - then nothing happens. It just sits there and grins at me. It only does that on the very first track, so if I f-fwd it to the 2nd or 3rd track it starts right up; if I have it switch and play any other disc it has no problems with that either. The discs do not reveal any physical damage to the naked eye, and these are discs that spend their entire lives in one slot inside a changer, not being removed and reloaded, removed and reloaded etc. I purchased the first disc thru a cd club (BMG, I think) so I doubt it's an illegal knockoff; the second I purchased new thru cdnow and both played flawlessly until after many jillions of plays. Rather odd, si? /jan - ----- Original Message ----- From: Lipman_Larry To: basia@smoe.org Sent: Thursday, November 27, 2003 5:25 PM Subject: CDs Happy Thanksgiving all! CDs don't really "wear out" as vinyl did. However, there has been some discussion of "laser rot" whereby the repeated "heat" of the laser might deform the pits and lands which reflect the laser light and create the pattern of "1s" and "0s" that are translated into audio. There has also been some discussion of mold creeping into the "pancake" of layers in discs not manufactured properly, though I haven't heard of either in a long, long, long time. Discs made in a factory are fairly safe for archival purposes, and I believe home-burn CDs should last 50 years if handled properly. (NARAS and AES can accurately answer those questions for sure.) What is likely happening is that the abrasion from sliding the CD across the jewel case/player load edge/etc is causing damage. I've also had some home-burn CDs rendered into coasters because the "business" ("silver") layer stuck to the inside of a non-tyvek sleeve. LL At 12:15 AM 11/26/2003, you wrote: From: "JC" ...I just bought a duplicate set of Basia cds because a couple of mine are showing signs of extreme wear. Whoever said cds don't wear out was incorrect... /jan ------------------------------ End of basia-digest V8 #188 ***************************