[Powderworks] Re: tech question: Black CDRs???
David A. Brass
amt4all@yahoo.com
Wed, 12 Feb 2003 18:51:36 -0800 (PST)
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(Very) Unfortunately...yes. Actually 1st noticed this aluminum coating oxidation back in 1995...a Dire Straits--Brothers In Arms (original release..1986) had developed those "holes" in it. All was fine until about 2 minutes into track 5 then the play would stop, requiring a "fast advance" through the next 2 minutes or so to continue playback...
Black-vinyl CD-R copies will outlast even the original commercial CDs so, copying those will also be an improvement to a collection...think I'll hang onto the originals anyway until the issues on these disks really are proven. Maybe do some durability testing myself....
I though warping of these black vinyl CD-Rs could be a problem...used to be a common occurance with those old 12" LPs...but, that was due to an uneven temperature gradient across the disk (12" diameter is pretty large)...the warmer areas expanded causing the warp (anyone who ever left a record album in the car during summer know about this). However the old 45 rpm singles (7"?) rarely warped, being much smaller in area and less likely have a major temperature gradient...so should be much less of a problem with CDs.
Also...using other metals (gold, platinum, etc.) on those clear acrylic disks can prevent the oxidation (those metals oxidize at extremely high temperatures but, the metal/acrylic bonding is really weak and prone to separation.
David A. Brass Arcata, California
Mike Blackwood <mikeb@cs.mun.ca> wrote:
Does this apply to all the commerically-produced cd's from the last 2
decades as well?!?! If so, this is a nightmare for a music geek like me!
Mike
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<P>(Very) Unfortunately...yes. Actually 1st noticed this aluminum coating oxidation back in 1995...a Dire Straits--Brothers In Arms (original release..1986) had developed those "holes" in it. All was fine until about 2 minutes into track 5 then the play would stop, requiring a "fast advance" through the next 2 minutes or so to continue playback...
<P>Black-vinyl CD-R copies will outlast even the original commercial CDs so, copying those will also be an improvement to a collection...think I'll hang onto the originals anyway until the issues on these disks really are proven. Maybe do some durability testing myself....
<P>I though warping of these black vinyl CD-Rs could be a problem...used to be a common occurance with those old 12" LPs...but, that was due to an uneven temperature gradient across the disk (12" diameter is pretty large)...the warmer areas expanded causing the warp (anyone who ever left a record album in the car during summer know about this). However the old 45 rpm singles (7"?) rarely warped, being much smaller in area and less likely have a major temperature gradient...so should be much less of a problem with CDs.
<P>Also...using other metals (gold, platinum, etc.) on those clear acrylic disks can prevent the oxidation (those metals oxidize at extremely high temperatures but, the metal/acrylic bonding is really weak and prone to separation.
<P>David A. Brass Arcata, California
<P> <B><I>Mike Blackwood <mikeb@cs.mun.ca></I></B> wrote:
<BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid"><BR>Does this apply to all the commerically-produced cd's from the last 2 <BR>decades as well?!?! If so, this is a nightmare for a music geek like me!<BR><BR>Mike<BR></BLOCKQUOTE><p><br><hr size=1>Do you Yahoo!?<br>
<a href="http://rd.yahoo.com/O=1/I=brandr/vday03/text/flow/*http://shopping.yahoo.com
/shop?d=browse&id=20146735">Yahoo! Shopping</a> - Send Flowers for Valentine's Day
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