LISTSERV mailing list manager LISTSERV 16.0

Help for ARSCLIST Archives


ARSCLIST Archives

ARSCLIST Archives


[email protected]


View:

Message:

[

First

|

Previous

|

Next

|

Last

]

By Topic:

[

First

|

Previous

|

Next

|

Last

]

By Author:

[

First

|

Previous

|

Next

|

Last

]

Font:

Proportional Font

LISTSERV Archives

LISTSERV Archives

ARSCLIST Home

ARSCLIST Home

ARSCLIST  August 2013

ARSCLIST August 2013

Subject:

Re: Save the Unicorns

From:

Tom Fine <[log in to unmask]>

Reply-To:

Association for Recorded Sound Discussion List <[log in to unmask]>

Date:

Wed, 7 Aug 2013 08:30:58 -0400

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (80 lines)

dBPowerAmp CD ripper does this process, too. It ends up with blank spots for the unrecoverable data, 
so the track lengths stay intact. I think it relies on freedb and accurip data to determine what the 
final track length/size needs to be. I had it grinding for over 3 hours on one scratched disc. It 
recovered about 90% of the fatally-damaged track, which was the same as useless to me. But it tried 
...

-- Tom Fine

----- Original Message ----- 
From: "Carl Pultz" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, August 07, 2013 8:21 AM
Subject: [ARSCLIST] Save the Unicorns


> Hey, here’s a way to get your geek on! Thanks Aaron. I'll try this on the one commercial disc I 
> have that suffers from fatal bit-rot - disc 2 of Mahler 3rd Horenstein on Unicorn-Kanchana. Disc 
> 1, and the disc of Sym 1, are also badly tarnished, but I could rip those successfully. Disc 2 
> wouldn't rip via EAC or Media Center. A real-time transfer from a CD player didn't work without a 
> few dropouts, although this has been successful on severely scratched up library discs when 
> ripping wouldn't work. Apparently the gaps are too big. This is a pity, because these issues are 
> hard to find and usually very expensive. Given their cult-like following, I'm surprised they 
> didn't have a second round of reissue. They are UK PDO pressings.
>
> Any other catalog series that are typically vulnerable to wasting? We should be proactive toward 
> preserving such items. This Mahler went from okay to not okay in just a couple years. OTOH, the 
> big kerfuffle over bit-rot predicted years ago seems to have been overstated. For USA collections, 
> the vast majority of CDs remain playable, at least based on the collections I know. Are others 
> finding more rotten beer coasters?
>
> -----Original Message-----
> From: Association for Recorded Sound Discussion List [mailto:[log in to unmask]] On Behalf 
> Of Aaron Bittel
> Sent: Tuesday, August 06, 2013 7:17 PM
> To: [log in to unmask]
> Subject: Re: [ARSCLIST] CD-R help request
>
> I have had some luck recovering data from burned discs using the command-line tool ddrescue:
> https://www.gnu.org/software/ddrescue/ddrescue.html
>
> A version for Mac (OS X 10.5+) is available here:
> http://tinyapps.org/blog/mac/200808220700_ddrescue_for_leopard.html
>
> ddrescue doesn't itself do any error correction, but rather extracts the readable data bit by 
> bit -- 
> often at many times slower than real-time, depending on the number of errors -- to a disc image
> file representing a complete read of the disc minus any bits that are missing.  You can then mount
> this disc image (OS X will do this natively) as if it were a CD-R and use the CD ripper/audio
> extractor/error correction software of your choice on it, which may be more successful than on-
> the-fly correction from the optical disc itself.
>
> Another feature of ddrescue is that you can run it multiple times on the same disc, and each time 
> it
> will go back and try to fill in the bits that are missing.  That obviously won't work with data 
> that's
> completely gone, but sometimes can recover data that didn't read correctly for some other reason.
> And these subsequent reads are faster because the program is only addressing the missing data,
> and skipping over the parts it has already successfully captured.
>
> But the best case will be if you have two copies of the degraded disc.  In this case ddrescue can
> scan both copies, merging them into one image that will probably be error-free, since it's 
> unlikely
> both discs have degraded in exactly the same places.  And again, only the missing bits are read
> from the second disc in an attempt to fill in the gaps.  [Disclaimer: I haven't used this 
> particular
> feature of ddrescue myself yet, but am describing it based on information on the project's web
> page.]
>
> It's a bit more involved than popping a disc in, firing up iTunes and clicking "extract," but it's
> worked for me when nothing else would.
>
> - Aaron
>
> --
> Aaron M. Bittel
> Archivist-Librarian/Digital Projects
> UCLA Ethnomusicology Archive
>
> 

Top of Message | Previous Page | Permalink

Advanced Options


Options

Log In

Log In

Get Password

Get Password


Search Archives

Search Archives


Subscribe or Unsubscribe

Subscribe or Unsubscribe


Archives

March 2024
February 2024
January 2024
December 2023
November 2023
October 2023
September 2023
August 2023
July 2023
June 2023
May 2023
April 2023
March 2023
February 2023
January 2023
December 2022
November 2022
October 2022
September 2022
August 2022
July 2022
June 2022
May 2022
April 2022
March 2022
February 2022
January 2022
December 2021
November 2021
October 2021
September 2021
August 2021
July 2021
June 2021
May 2021
April 2021
March 2021
February 2021
January 2021
December 2020
November 2020
October 2020
September 2020
August 2020
July 2020
June 2020
May 2020
April 2020
March 2020
February 2020
January 2020
December 2019
November 2019
October 2019
September 2019
August 2019
July 2019
June 2019
May 2019
April 2019
March 2019
February 2019
January 2019
December 2018
November 2018
October 2018
September 2018
August 2018
July 2018
June 2018
May 2018
April 2018
March 2018
February 2018
January 2018
December 2017
November 2017
October 2017
September 2017
August 2017
July 2017
June 2017
May 2017
April 2017
March 2017
February 2017
January 2017
December 2016
November 2016
October 2016
September 2016
August 2016
July 2016
June 2016
May 2016
April 2016
March 2016
February 2016
January 2016
December 2015
November 2015
October 2015
September 2015
August 2015
July 2015
June 2015
May 2015
April 2015
March 2015
February 2015
January 2015
December 2014
November 2014
October 2014
September 2014
August 2014
July 2014
June 2014
May 2014
April 2014
March 2014
February 2014
January 2014
December 2013
November 2013
October 2013
September 2013
August 2013
July 2013
June 2013
May 2013
April 2013
March 2013
February 2013
January 2013
December 2012
November 2012
October 2012
September 2012
August 2012
July 2012
June 2012
May 2012
April 2012
March 2012
February 2012
January 2012
December 2011
November 2011
October 2011
September 2011
August 2011
July 2011
June 2011
May 2011
April 2011
March 2011
February 2011
January 2011
December 2010
November 2010
October 2010
September 2010
August 2010
July 2010
June 2010
May 2010
April 2010
March 2010
February 2010
January 2010
December 2009
November 2009
October 2009
September 2009
August 2009
July 2009
June 2009
May 2009
April 2009
March 2009
February 2009
January 2009
December 2008
November 2008
October 2008
September 2008
August 2008
July 2008
June 2008
May 2008
April 2008
March 2008
February 2008
January 2008
December 2007
November 2007
October 2007
September 2007
August 2007
July 2007
June 2007
May 2007
April 2007
March 2007
February 2007
January 2007
December 2006
November 2006
October 2006
September 2006
August 2006
July 2006
June 2006
May 2006
April 2006
March 2006
February 2006
January 2006
December 2005
November 2005
October 2005
September 2005
August 2005
July 2005
June 2005
May 2005
April 2005
March 2005
February 2005
January 2005
December 2004
November 2004
October 2004
September 2004
August 2004
July 2004
June 2004
May 2004
April 2004
March 2004
February 2004
January 2004
December 2003
November 2003
October 2003
September 2003
August 2003
July 2003
June 2003
May 2003
April 2003
March 2003
February 2003
January 2003

ATOM RSS1 RSS2



LISTSERV.LOC.GOV

CataList Email List Search Powered by the LISTSERV Email List Manager