[ale] OT: Labels on CD-Rs

[Dow Hurst]

Let's calculate the forces on the label!  Basic physics so pull out that 
old book from college and get to work! :-)

Actually, I have to get busy with what I am being paid to do here at KSU 
so no joy on the numbers.  But, yes, remember in lab when you had to 
spin your test tube in the centrifuge and were required to balance it? 
 No difference.  I am sure you've noticed the terrible noises from even 
slightly unbalanced CDs.  The bearings in your CD have to manage the 
load so I am sure it wears them out sooner to use such CDs.
Dow


Jeff Hubbs wrote:

>I had a couple of rolls of film developed at Wal-Mart today and I've
>started having a CD made whenever I take film in; keeps me from having
>to scan prints and it's not all that expensive.
>
>Anyway, I picked up my stuff and the CD - a Memorex CD-R - and they had
>stuck a roughly 1" by 4" rectangular printed adhesive label on the back
>of the CD-R.
>
>Now, back in the day, I know you could do that and it was no big deal,
>but now that we have 52-time and 58-time CD drives, it's my
>understanding that you can't even get too heavyhanded with a Sharpie
>anymore and that you in fact run the risk of having the CD-R shatter in
>the drive.  
>
>Anyway, when I got home, I saw the label and said, this has got to go,
>so I started to peel it off and...whoops, off comes a roughly 3cm by 3cm
>patch of the the white CD backing, with the aluminum on one side of
>it!!!!  Left behind was laser-etched tinted transparent plastic!!
>
>It has been my understanding that a metal-less CD can actually be read,
>however, I think that the slightly-pulled-up aluminum around the ragged
>edges of this hole in the backing makes it impossible to read - I tried
>it in several drives.
>
>It occurs to me that this must be a really cheap CD-R that has the
>reflective coating under what appears to be no more than a layer of
>paint.  I want to bring my negs back to get them to burn me a new CD-R,
>but I think I'll bring them one of my own blanks.
>
>So am I right to have tried to remove the label?  I didn't even want to
>put it in a drive because I could imagine the vibration that would set
>up and that's not a good thing to do to a hard drive, bolted in just
>below.
>
>- Jeff
>
>
>
>
>
>
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-- 
__________________________________________________________
Dow Hurst                  Office: 770-499-3428
Systems Support Specialist    Fax: 770-423-6744
1000 Chastain Rd., Bldg. 12
Chemistry Department SC428  Email:dhurst at kennesaw.edu
Kennesaw State University         Dow.Hurst at mindspring.com
Kennesaw, GA 30144
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