[LINK] Guidelines for Digital Repositories, Canberra, 27 July

Kim Holburn kim at holburn.net
Fri Jul 21 15:21:37 AEST 2006

On 2006 Jul 21, at 3:07 PM, Karl Auer wrote:
> On Fri, 2006-07-21 at 14:29 +1000, Markus Buchhorn wrote:
>> Regarding bit-rot, you can avoid that by reducing your compression
>> ratio a bit, by including full error-correction information  
>> (basically
>> checksums).
> Um, it's VERY expensive if the data is voluminous. So expensive  
> that it
> is almost always cheaper to compress the hell out of stuff, store it
> multiple times, protect it well, then keep recopying it and  
> checking it
> against itself. That is basically what biological systems do.

You can also use more stable compression systems with ideas like  
Rusty's gzip patches
Basically you shorten the compression frames - Start from zero much  
more often.  It would make the compression less efficient probably.   
I don't think anyone has designed compression for archiving although  
I'm sure it could be done.

Kim Holburn
Network Consultant
Ph: +61 2 61258620 M: +61 417820641  F: +61 2 6230 6121
mailto:kim at holburn.net  aim://kimholburn
skype://kholburn - PGP Public Key on request
Cacert Root Cert: http://www.cacert.org/cacert.crt
Aust. Spam Act: To stop receiving mail from me: reply and let me know.
Use ISO 8601 dates [YYYY-MM-DD] http://www.saqqara.demon.co.uk/ 

Democracy imposed from without is the severest form of tyranny.
                           -- Lloyd Biggle, Jr. Analog, Apr 1961

More information about the Link mailing list