Re: [ARSCLIST] 5" discs more hearty than some think

[Joe_Iraci@xxxxxxxxx]

I have tested a variety of CD-Rs (phthalocyanine, cyanine, azo) and DVD-Rs
in terms of exposure to sunlight through a window and office fluorescent
light.

Phthalocyanine did not change for either sunlight or room light exposure
(24 hours per day).

Azo and cyanine did change, sometimes significantly. It depends on many
factors including disc quality. For sunlight through a window the changes
occurred in as little as 1 to 3 weeks for the poorest quality discs. For
room light, comparable changes occurred in 3 to 8 weeks. Note that there
was no heat effect for the room light samples. Some moderate heating
occurred with the window samples.

For DVD-Rs, the poor quality samples were okay for about 2 months with
sunlight exposure through the window. The best samples showed only small
changes after 8 months of exposure. Only the poorest DVD-R samples were
affected by room light. Changes started to occur at about the 3 month mark.
Most DVD-Rs subjected to room light exposure were still in excellent
condition after 8 months of exposure.

Joe


                                                                           
             Rod Stephens                                                  
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             <ARSCLIST@xxxxxxx         Re: [ARSCLIST] 5" discs more hearty 
             >                         than some think                     
                                                                           
                                                                           
             02/08/2006 01:59                                              
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Tom Fine wrote:

> Hey guys, is this a "guerilla" longevity test?

Well, this is "Guerilla Rod" with a reply from triple digit northern
California (Redding where we've been breaking heat records) to Richard
Hess's question as to the type of CDs I used.   My employer, Family
Theater Productions, gave me packs of 50 unlabled blanks, but they're
identified in the center ring as "Mitsui Color Thermal".

> Neato! I can say that the dirt-cheapo green-dye types don't stand up
> to a summer and winter in suburban NY, especially if the green side
> gets hit with sunlight. It was 105 degrees today (according to car
> thermometer) and had to be a good 10 degrees more in the car when I
> got in to drive home. Figured I'd test the media, so I played the
> commercially-manufactured disc in the drive. It played just fine. It
> was damn hot to the touch when I took it out at home! That
> factory-standard Delco CD player impressed me too. That's a lot of
> internal heat to deal with.

Along with the CDs, I've got reams of 10 1/2" reels of tape masters
which also have stood up well in the extremes of our weather (also we
have ice and snow in the winter).  These types of media are more robust
than we have a right to expect from my own experiences.

Rod Stephens

P.S.  I have two boxes of Scotch tape (No. 131-24 Low Print and 111
Plastic All Purpose) with the photo of the studio musicians which I'll
try to scan and make available in a few days.  One's with a red wash and
the other is green.

>
> -- Tom Fine
>
> ----- Original Message ----- From: "Richard L. Hess"
> <arclists@xxxxxxxxxxxxxxx>
> To: <ARSCLIST@xxxxxxxxxxxxxxxx>
> Sent: Tuesday, August 01, 2006 1:23 PM
> Subject: Re: [ARSCLIST] 5" discs more hearty than some think
>
>
>> At 10:29 AM 8/1/2006, Rod Stephens wrote:
>>
>>> I've had a series of about 200 CDs that I manufactured and stored in
>>> my garage for about two years.  The temperature gets to be over 100
>>> degrees in the summer in there.  I just pulled them out and did spot
>>> checks on every five or ten of them in sequence (old radio shows).
>>> They all tested and played beautifully.  Just a bit of personal
>>> experience.
>>>
>>
>> Hi, Rod,
>>
>> Could you please share with us the type of disc that you used for this?
>>
>> I have had CDs in my car in both hot Southern California and now
>> hot/humid AND cold Greater Toronto area. I made a set of about 120
>> and I have only seen a few failures. Those were in the non
>> phthalocyanin dye discs. All of the MAM-A discs have survived nicely
>> since 2001.
>>
>> Cheers,
>>
>> Richard
>>
>>
>> Richard L. Hess                   email: richard@xxxxxxxxxxxxxxx
>> Aurora, Ontario, Canada       (905) 713 6733     1-877-TAPE-FIX
>> Detailed contact information:
>> http://www.richardhess.com/tape/contact.htm
>> Quality tape transfers -- even from hard-to-play tapes.
>
>