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Re: [OM] Data on Burnable CD Lifetime [was: IMG: Testing times]

Subject: Re: [OM] Data on Burnable CD Lifetime [was: IMG: Testing times]
From: "Wayne Harridge" <wayne.harridge@xxxxxxxxxxxxxxxxxxx>
Date: Fri, 15 Dec 2017 14:04:55 +1100
>From Wikipedia:

Denatured alcohol, also called methylated spirits or denatured rectified 
spirit, is ethanol that has additives to make it poisonous, bad tasting, foul 
smelling or nauseating, to discourage recreational consumption. In some cases 
it is also dyed. Pyridine, methanol,[1] or both can be added to make denatured 
alcohol poisonous, and denatonium can be added to make it bitter.

So it's basically ethanol, a clean spirit like vodka would probably work too !

...Wayne



-----Original Message-----
From: olympus 
[mailto:olympus-bounces+wayne.harridge=structuregraphs.com@xxxxxxxxxxxxxxxxx] 
On Behalf Of Bill Pearce
Sent: Friday, 15 December 2017 11:56 AM
To: Olympus Camera Discussion <olympus@xxxxxxxxxxxxxxxxx>
Subject: Re: [OM] Data on Burnable CD Lifetime [was: IMG: Testing times]

I'm curious, as most of my home-burned CD's are unreadable. What is/are 
methylated spirits in American english? 

----- Original Message -----

From: "Wayne Harridge" <wayne.harridge@xxxxxxxxxxxxxxxxxxx> 
To: "Olympus Camera Discussion" <olympus@xxxxxxxxxxxxxxxxx> 
Sent: Thursday, December 14, 2017 5:34:07 PM 
Subject: Re: [OM] Data on Burnable CD Lifetime [was: IMG: Testing times] 

Jan, 
A few years ago I borrowed some software CDs (~25) from a friend so that I 
could rebuild an old VAX system. He said that I might not be able to read all 
of them successfully but if I wiped the surface with methylated spirits they 
would probably be ok. Anyhow, I gave it a try and ~5 CDs failed to read 
initially but after a wipe over with methylated spirits they worked ok. I 
assume that the methylated spirits removed some sort of scum from the surface 
which affected the optical properties of the surface, maybe something either 
from the CD itself of perhaps the plastic sleeves they were stored in. 

If you haven't yet disposed of the faulty CDs it might be worth trying to give 
them a bit of a clean. 

...Wayne 



-----Original Message----- 
From: olympus 
[mailto:olympus-bounces+wayne.harridge=structuregraphs.com@xxxxxxxxxxxxxxxxx] 
On Behalf Of Jan Steinman 
Sent: Friday, 15 December 2017 7:37 AM 
To: olympus@xxxxxxxxxxxxxxxxx 
Subject: [OM] Data on Burnable CD Lifetime [was: IMG: Testing times] 

> From: Jan Steinman <Jan@xxxxxxxxxxxxxx> 
> 
> I?m currently crawling through stacks of CDs I?ve burned, trying to recover 
> hi-rez scans. About a third of them were put on very cheap CDs, 80% of which 
> will no longer read. 

Perhaps an interesting data point, perhaps not, to those ungulates who are 
profoundly disinterested in optical media? :-) 

I?ve now gone through about 250 CD-ROMs. These contained a mix of brand-name 
blanks (Memorex, Verbatim), branded bargain blanks, and un-branded, un-coated, 
no-name blanks. 250 of these were in three original holders of about 50 each, 
with a latching plastic cover. The other 100 were stored on a long plastic 
spindle, with plastic base and top, but basically open to the atmosphere. (This 
was the way the cheapest, non-labeled disks were bundled for retail.) 

Almost all of them with a label, whether a well-known brand or not, worked 
fine. These were mixed fairly evenly among the different holders with the 
non-labeled, no-name ones. 

Of the non-labeled, no-name disks, over 90% of the ones enclosed in clear 
plastic cases FAILED, whereas all but one of them that were on the spindle READ 
JUST FINE! 

Of course, this was not a controlled experiment. They were in an enclosed 
cabinet, but perhaps the spindle was closer to the back and farther from 
occasional light. Who knows what other variables might have worked in favour of 
the spindled ones. 

But if you?re storing CD-ROMs, particularly if they are cheap ones without a 
top coating, perhaps you want to expose them to the atmosphere, rather than 
shield them in clear plastic cases. :-) 

No worries. I?ve now got my Frakenbellows working, and I?ll review the PAPER 
index sheets of the missing photos for the best, and shoot 50 megapixel images 
of the Kodachromes. (The non-Kodachrome film has all faded quite a bit.) I?m 
also looking forward to ?scanning? my Velvia 4?x5? film in such a manner. 

:::: The factory farm results from the absence of moral or regulatory 
restraint. -- Ron Schmid <http://www.lmgtfy.com/?q=Ron+Schmid> 
:::: Jan Steinman, EcoReality Co-op <http://www.ecoreality.org/> :::: 

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