[TUHS] mach & nextstep.

[TUHS] mach & nextstep.

[Jose R. Valverde]

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Bad luck. The CD's are lost (unreadable actually). Not surprising seeing as they
were old and had been tossed around so many times (sic).

Maybe the original request for Mach sources should be redirected to comp.os.mach
or to some of the original authors to see if they still keep something around. 
It might be that even CMU keeps something.

					j

> I *think* I have.
> 
> Thank goodness yo mention this! I believe I have copies on CD-ROM dating back
> from '94 or so. I'll dig them up. The problem is I believed I also had them on
> the FTP server, but they aren't. I must have lost them on one disk crash or
> another and didn't notice, so your question is great for I might part of the
> original CDs and lose it.
> 
> 'nuff said. I'll check this afternoon when I go back home and try to find again
> those old CDs (cross your fingers).

					

-- 
	These opinions are mine and only mine. Hey man, I saw them first!

			    José R. Valverde

	De nada sirve la Inteligencia Artificial cuando falta la Natural
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[TUHS] Recovering flaky CDs (was: mach & nextstep.)

[Greg 'groggy' Lehey]

On Thursday, 11 October 2007 at 15:14:01 +0200, Jose R. Valverde wrote:
>> I *think* I have.
>>
>> Thank goodness yo mention this! I believe I have copies on CD-ROM dating back
>> from '94 or so. I'll dig them up. The problem is I believed I also had them on
>> the FTP server, but they aren't. I must have lost them on one disk crash or
>> another and didn't notice, so your question is great for I might part of the
>> original CDs and lose it.
>>
>> 'nuff said. I'll check this afternoon when I go back home and try to find again
>> those old CDs (cross your fingers).
>
> Bad luck. The CD's are lost (unreadable actually). Not surprising
> seeing as they were old and had been tossed around so many times
> (sic).

Is there anybody on this list who knows a way of recovering flaky CDs?

Greg
--
Finger grog at lemis.com for PGP public key.
See complete headers for address and phone numbers.
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[TUHS] Recovering flaky CDs

[Al Kossow]

Greg 'groggy' Lehey wrote:

> Is there anybody on this list who knows a way of recovering flaky CDs?
>

Easiest first step is try using different kinds of CD/CD-R/DVD-R drives.

I have found some 'unreadable' CDs could be read using a DVD drive.

[TUHS] Recovering flaky CDs

[asbesto]

Tue, Oct 30, 2007 at 04:26:14PM -0700, Al Kossow wrote:

> > Is there anybody on this list who knows a way of recovering flaky CDs?
> Easiest first step is try using different kinds of CD/CD-R/DVD-R drives.
> I have found some 'unreadable' CDs could be read using a DVD drive.

I remember a very old SONY cd-rom reader capable of reading very
damaged cd! It was the SONY CDU-33A, it has his
own controller, so was not an IDE or SCSI drive. But it can be
connected to an old soundcard like Spectrum or other similars,
having some cdrom interfaces.

sorry for my  bad english :)




-- 
[ 73 de IW9HGS : freaknet medialab : radiocybernet : poetry hacklab]
[ http://freaknet.org/asbesto -  http://papuasia.org/radiocybernet ]
[ NON SCRIVERMI USANDO LETTERE ACCENTATE!  - NON MANDARMI ALLEGATI ]
[ *I DELETE* EMAIL > 100K, ATTACHMENTS, HTML, M$-WORD DOC and SPAM ]

[TUHS] Recovering flaky CDs (was: mach & nextstep.)

[Jose R. Valverde]

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On Wed, 31 Oct 2007 09:36:55 +1100
Greg 'groggy' Lehey <grog at lemis.com> wrote:
> On Thursday, 11 October 2007 at 15:14:01 +0200, Jose R. Valverde wrote:
> >> I *think* I have.
> 
> Is there anybody on this list who knows a way of recovering flaky CDs?

It depends. If the content is not damaged then you can probably "wipe" them.
I mean, look at the printed side: if there are scratches there chances are 
the data is damaged as well and you may be out of luck (depends on whether it
affects the catalog).

However, if the printed surface is not terribly damaged, and the problem is 
that the mirror-looking side is scratched then your data may be healthy and 
it is surface irregularity that distorts the laser. There are kits out there
that can wipe the surface and render it again smooth. I used one such kit 
several years ago with good results. Casually, it's on the shelf in front
of my eyes now.. lemme see... It says

	CURTIS disk restore. Radial scratch repair and cleaning system for
CD/DVD discs. www.curtis.com

According to the box it will not repair gauges, deep scratches, label-side
damaging or warping.

				j
-- 
	These opinions are mine and only mine. Hey man, I saw them first!

			    José R. Valverde

	De nada sirve la Inteligencia Artificial cuando falta la Natural
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[TUHS] Recovering flaky CDs

[James Petts]

> ----- Original Message -----
> From: asbesto <asbesto at freaknet.org>
> To: "Al Kossow" <aek at bitsavers.org>
> Subject: Re: [TUHS] Recovering flaky CDs
> Date: Wed, 31 Oct 2007 10:22:33 +0100
> 
> 
> Tue, Oct 30, 2007 at 04:26:14PM -0700, Al Kossow wrote:
> 
> > > Is there anybody on this list who knows a way of recovering flaky CDs?
> > Easiest first step is try using different kinds of CD/CD-R/DVD-R drives.
> > I have found some 'unreadable' CDs could be read using a DVD drive.
> 
> I remember a very old SONY cd-rom reader capable of reading very
> damaged cd! It was the SONY CDU-33A, it has his
> own controller, so was not an IDE or SCSI drive. But it can be
> connected to an old soundcard like Spectrum or other similars,
> having some cdrom interfaces.
> 
> sorry for my  bad english :)
> 
> 

Those CD Doctor "cleaners" (they actually do a minor
resurfacing of the disc) have rescued several discs
for me.

[TUHS] Recovering flaky CDs

[asbesto]

Wed, Oct 31, 2007 at 08:25:00AM -0800, James Petts wrote:

> > > > Is there anybody on this list who knows a way of recovering flaky CDs?
> > > Easiest first step is try using different kinds of CD/CD-R/DVD-R drives.
> > > I have found some 'unreadable' CDs could be read using a DVD drive.
> > I remember a very old SONY cd-rom reader capable of reading very
> > damaged cd! It was the SONY CDU-33A, it has his
> > own controller, so was not an IDE or SCSI drive. But it can be
> Those CD Doctor "cleaners" (they actually do a minor
> resurfacing of the disc) have rescued several discs
> for me.

A great problem I had some time ago was a sort of oxydation of the
cd material; this seem to happen using very bad cd brands. i had
this horrible problems with "SEANTRAM" and "PRINCO" cd's; the 
princo cd was literally unreadable after only 6 months of age!


-- 
[ 73 de IW9HGS : freaknet medialab : radiocybernet : poetry hacklab]
[ http://freaknet.org/asbesto -  http://papuasia.org/radiocybernet ]
[ NON SCRIVERMI USANDO LETTERE ACCENTATE!  - NON MANDARMI ALLEGATI ]
[ *I DELETE* EMAIL > 100K, ATTACHMENTS, HTML, M$-WORD DOC and SPAM ]

[TUHS] Recovering flaky CDs

[Wilko Bulte]

Quoting asbesto, who wrote on Wed, Oct 31, 2007 at 05:47:36PM +0100 ..
> Wed, Oct 31, 2007 at 08:25:00AM -0800, James Petts wrote:
> 
> > > > > Is there anybody on this list who knows a way of recovering flaky CDs?
> > > > Easiest first step is try using different kinds of CD/CD-R/DVD-R drives.
> > > > I have found some 'unreadable' CDs could be read using a DVD drive.
> > > I remember a very old SONY cd-rom reader capable of reading very
> > > damaged cd! It was the SONY CDU-33A, it has his
> > > own controller, so was not an IDE or SCSI drive. But it can be
> > Those CD Doctor "cleaners" (they actually do a minor
> > resurfacing of the disc) have rescued several discs
> > for me.
> 
> A great problem I had some time ago was a sort of oxydation of the
> cd material; this seem to happen using very bad cd brands. i had

Note that the reflecting layer in factory produced CDs is aluminium.
A thin layer of lacquer is protecting the reflector.

As an interesting eye opening experiment I dumped one of these AOL promo CDs
we used to be bombarded with in a bowl of lukewarm water.  Plain water, 25
degrC. Within a day the aluminium layer had holes in it the size of dimes.
Apparantly the protective lacquer was very substandard.

El-cheapo CDR can have similar characteristics.

Wilko

[TUHS] Recovering flaky CDs

[Warner Losh]

From: "James Petts" <jpetts@operamail.com>
Subject: Re: [TUHS] Recovering flaky CDs
Date: Wed, 31 Oct 2007 08:25:00 -0800

> > ----- Original Message -----
> > From: asbesto <asbesto at freaknet.org>
> > To: "Al Kossow" <aek at bitsavers.org>
> > Subject: Re: [TUHS] Recovering flaky CDs
> > Date: Wed, 31 Oct 2007 10:22:33 +0100
> > 
> > 
> > Tue, Oct 30, 2007 at 04:26:14PM -0700, Al Kossow wrote:
> > 
> > > > Is there anybody on this list who knows a way of recovering flaky CDs?
> > > Easiest first step is try using different kinds of CD/CD-R/DVD-R drives.
> > > I have found some 'unreadable' CDs could be read using a DVD drive.
> > 
> > I remember a very old SONY cd-rom reader capable of reading very
> > damaged cd! It was the SONY CDU-33A, it has his
> > own controller, so was not an IDE or SCSI drive. But it can be
> > connected to an old soundcard like Spectrum or other similars,
> > having some cdrom interfaces.
> > 
> > sorry for my  bad english :)
> > 
> > 
> 
> Those CD Doctor "cleaners" (they actually do a minor
> resurfacing of the disc) have rescued several discs
> for me.

I've used cdparanoia to recover badly damaged audio disks.  Are there
not similar programs for data disks?

Warner

[TUHS] Recovering flaky CDs

[Angus Robinson]

Warner Losh wrote:
> From: "James Petts" <jpetts at operamail.com>
> Subject: Re: [TUHS] Recovering flaky CDs
> Date: Wed, 31 Oct 2007 08:25:00 -0800
>
>   
>>> ----- Original Message -----
>>> From: asbesto <asbesto at freaknet.org>
>>> To: "Al Kossow" <aek at bitsavers.org>
>>> Subject: Re: [TUHS] Recovering flaky CDs
>>> Date: Wed, 31 Oct 2007 10:22:33 +0100
>>>
>>>
>>> Tue, Oct 30, 2007 at 04:26:14PM -0700, Al Kossow wrote:
>>>
>>>       
>>>>> Is there anybody on this list who knows a way of recovering flaky CDs?
>>>>>           
>>>> Easiest first step is try using different kinds of CD/CD-R/DVD-R drives.
>>>> I have found some 'unreadable' CDs could be read using a DVD drive.
>>>>         
>>> I remember a very old SONY cd-rom reader capable of reading very
>>> damaged cd! It was the SONY CDU-33A, it has his
>>> own controller, so was not an IDE or SCSI drive. But it can be
>>> connected to an old soundcard like Spectrum or other similars,
>>> having some cdrom interfaces.
>>>
>>> sorry for my  bad english :)
>>>
>>>
>>>       
>> Those CD Doctor "cleaners" (they actually do a minor
>> resurfacing of the disc) have rescued several discs
>> for me.
>>     
>
> I've used cdparanoia to recover badly damaged audio disks.  Are there
> not similar programs for data disks?
>
> Warner
>   

Dont know how true it is but the local paper here was running a story 
about some students using goverment condoms to fix scratched cd's. They 
worked for 3 uses. Never tried it as most of the stuff i have on cd i 
can get again.

Regards,
Angus

> _______________________________________________
> TUHS mailing list
> TUHS at minnie.tuhs.org
> https://minnie.tuhs.org/mailman/listinfo/tuhs
>   
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[TUHS] Recovering flaky CDs

[Wesley Parish]

On Thursday 01 November 2007 06:15, Angus Robinson wrote:
> Warner Losh wrote:
> > From: "James Petts" <jpetts at operamail.com>
> > Subject: Re: [TUHS] Recovering flaky CDs
> > Date: Wed, 31 Oct 2007 08:25:00 -0800
> >
> >>> ----- Original Message -----
> >>> From: asbesto <asbesto at freaknet.org>
> >>> To: "Al Kossow" <aek at bitsavers.org>
> >>> Subject: Re: [TUHS] Recovering flaky CDs
> >>> Date: Wed, 31 Oct 2007 10:22:33 +0100
> >>>
> >>> Tue, Oct 30, 2007 at 04:26:14PM -0700, Al Kossow wrote:
> >>>>> Is there anybody on this list who knows a way of recovering flaky
> >>>>> CDs?
> >>>>
<snip>
> >>
> >> Those CD Doctor "cleaners" (they actually do a minor
> >> resurfacing of the disc) have rescued several discs
> >> for me.
> >
> > I've used cdparanoia to recover badly damaged audio disks.  Are there
> > not similar programs for data disks?
> >
> > Warner
>
> Dont know how true it is but the local paper here was running a story
> about some students using goverment condoms to fix scratched cd's. They
> worked for 3 uses. Never tried it as most of the stuff i have on cd i
> can get again.

Ignoring the inevitable ribald humour arising from the concept - "supersized, 
for all the government d*ckheads" ... ;)

A friend of mine suggested using a silver polisher to resurface the plastic 
when the scratches prevent it from being readable, but I've never tried it.

Wesley Parish
>
> Regards,
> Angus
>
> > _______________________________________________
> > TUHS mailing list
> > TUHS at minnie.tuhs.org
> > https://minnie.tuhs.org/mailman/listinfo/tuhs

-- 
Clinersterton beademung, with all of love - RIP James Blish
-----
Gaul is quartered into three halves.  Things which are 
impossible are equal to each other.  Guerrilla 
warfare means up to their monkey tricks. 
Extracts from "Schoolboy Howlers" - the collective wisdom 
of the foolish.
-----
Mau e ki, he aha te mea nui?
You ask, what is the most important thing?
Maku e ki, he tangata, he tangata, he tangata.
I reply, it is people, it is people, it is people.

[TUHS] Recovering flaky CDs

[Jochen Kunz]

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On Wed, 31 Oct 2007 10:56:29 -0600 (MDT)
Warner Losh <imp at bsdimp.com> wrote:

> I've used cdparanoia to recover badly damaged audio disks.  Are there
> not similar programs for data disks?
cdrdao can do similar things for audio and data disks.
-- 


tschüß,
       Jochen

Homepage: http://www.unixag-kl.fh-kl.de/~jkunz/

[TUHS] Recovering flaky CDs

[Pete Turnbull]

On 01/11/2007 08:03, Jochen Kunz wrote:
> On Wed, 31 Oct 2007 10:56:29 -0600 (MDT)
> Warner Losh <imp at bsdimp.com> wrote:
> 
>> I've used cdparanoia to recover badly damaged audio disks.  Are there
>> not similar programs for data disks?
> cdrdao can do similar things for audio and data disks.

Yes, cdrdao uses the cdparanoia libraries for reading.

-- 

Pete						Peter Turnbull
						Network Manager
						University of York

[TUHS] Recovering flaky CDs

[James Petts]

> ----- Original Message -----
> From: "Wilko Bulte" <wb at freebie.xs4all.nl>
> To: asbesto <asbesto at freaknet.org>
> Subject: Re: [TUHS] Recovering flaky CDs
> Date: Wed, 31 Oct 2007 19:09:11 +0100
> 
> 
> Quoting asbesto, who wrote on Wed, Oct 31, 2007 at 05:47:36PM +0100 ..
> > Wed, Oct 31, 2007 at 08:25:00AM -0800, James Petts wrote:
> >
> > > > > > Is there anybody on this list who knows a way of 
> > recovering flaky CDs?
> > > > > Easiest first step is try using different kinds of 
> > CD/CD-R/DVD-R drives.
> > > > > I have found some 'unreadable' CDs could be read using a DVD drive.
> > > > I remember a very old SONY cd-rom reader capable of reading very
> > > > damaged cd! It was the SONY CDU-33A, it has his
> > > > own controller, so was not an IDE or SCSI drive. But it can be
> > > Those CD Doctor "cleaners" (they actually do a minor
> > > resurfacing of the disc) have rescued several discs
> > > for me.
> >
> > A great problem I had some time ago was a sort of oxydation of the
> > cd material; this seem to happen using very bad cd brands. i had
> 
> Note that the reflecting layer in factory produced CDs is aluminium.
> A thin layer of lacquer is protecting the reflector.
> 
> As an interesting eye opening experiment I dumped one of these AOL promo CDs
> we used to be bombarded with in a bowl of lukewarm water.  Plain water, 25
> degrC. Within a day the aluminium layer had holes in it the size of dimes.
> Apparantly the protective lacquer was very substandard.
> 
> El-cheapo CDR can have similar characteristics.

And it is the top side (label side) of the CD that is most
fragile, not the reading side. There is about 0.5 mm of
plastic that can take some pretty fearsome scratches and
still be readable, or at least resurfaceable (is that a
word?).

[TUHS] Recovering flaky CDs

[asbesto]

Wed, Oct 31, 2007 at 10:19:05AM -0800, James Petts wrote:

> > > A great problem I had some time ago was a sort of oxydation of the
> > > cd material; this seem to happen using very bad cd brands. i had

> > degrC. Within a day the aluminium layer had holes in it the size of dimes.
> > Apparantly the protective lacquer was very substandard.
> And it is the top side (label side) of the CD that is most
> fragile, not the reading side. There is about 0.5 mm of

YES - and the oxidation I had was on the top "label" side,
affecting also the reading side :(

p.s.

the lack of "reply-to" in this mailing list is very, very
annoying, because it generate a lot of duplicates.

8(

-- 
[ 73 de IW9HGS : freaknet medialab : radiocybernet : poetry hacklab]
[ http://freaknet.org/asbesto -  http://papuasia.org/radiocybernet ]
[ NON SCRIVERMI USANDO LETTERE ACCENTATE!  - NON MANDARMI ALLEGATI ]
[ *I DELETE* EMAIL > 100K, ATTACHMENTS, HTML, M$-WORD DOC and SPAM ]

[TUHS] Recovering flaky CDs

[Wilko Bulte]

Quoting asbesto, who wrote on Wed, Oct 31, 2007 at 07:28:46PM +0100 ..
> Wed, Oct 31, 2007 at 10:19:05AM -0800, James Petts wrote:
> 
> > > > A great problem I had some time ago was a sort of oxydation of the
> > > > cd material; this seem to happen using very bad cd brands. i had
> 
> > > degrC. Within a day the aluminium layer had holes in it the size of dimes.
> > > Apparantly the protective lacquer was very substandard.
> > And it is the top side (label side) of the CD that is most
> > fragile, not the reading side. There is about 0.5 mm of
> 
> YES - and the oxidation I had was on the top "label" side,
> affecting also the reading side :(

Yep, the protective lacquer is on the label/top side.  The bottom
part aka the disc itself is polycarbonate (IIRC)

> p.s.
> 
> the lack of "reply-to" in this mailing list is very, very
> annoying, because it generate a lot of duplicates.

procmail is you friend.  At least it is my friend ;)

Wilko