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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: Mike Bloor <admin@xxxxxxxxxx>
Date: Tue, 02 Jan 2018 15:51:57 +0000
This thread worried me, so over Xmas I copied a lot of CDs to a NAS box. They were all written in 2005-2006. Memorex CDROMs that have been stored in CD "albums".

I successfully copied over 6,000 images. Only one file failed to copy, even after the meths treatment.

I did find Windows drag and drop to be dreadfully slow. It took 40 minutes or more to copy a single CD with the drive clicking away, presumably repeatedly seeking between the directory and data. After a few CDs I switched to Robocopy, which would move a full CD to the NAS in about four minutes.

Mike

At 08:22 15/12/2017, you wrote:

Or, I could use Evercleear.
----- Original Message -----

From: "David Thatcher" <plusphoto@xxxxxxxxxx>
To: "Olympus Camera Discussion" <olympus@xxxxxxxxxxxxxxxxx>
Sent: Thursday, December 14, 2017 8:09:29 PM
Subject: Re: [OM] Data on Burnable CD Lifetime [was: IMG: Testing times]

The US equivalent is 'denatured alcohol'.

Methylated spirits is mostly ethyl alcohol, and in the past
'denatured' with methyl alcohol to discourage drinking. These days it
contains bittering agents and sometimes colour dye.

I imagine you might be able to use iso-propyl alcohol (sold as rubbing
alcohol in the US, though you'd have to be careful to make sure it was
only IPA and water, some have oils etc. added)

davidt


On Thu, Dec 14, 2017 at 07:56:04PM -0500, Bill Pearce wrote:
> 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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