Slides from May talk now available

[S P Arif Sahari Wibowo]

On Wed, 20 May 2009, Lennart Sorensen wrote:
> Package: dvdisaster

Thanks! I was looking for this the other day but cannot remember 
the name.

Given that - as in my original question - how is the feasibility 
of archival grade (so called medical grade) CD-R and DVD-R as 
backup & archiving solution? And where can we find those kind of 
CD-R and DVD-R in GTA anyway?

> You can span an archive across many discs and spread the error 
> correction data too, so that it can even recover from complete 
> loss of one or more discs in the set.

Probably useful as well if doubled with dvdisaster above (in 
months or years it is more likely to have all the disks in 
various states of corruptions).


And how about solid state drive / storage (i.e. external flash 
memories)?


> although the tape media could degrade over time perhaps, while 
> bearings in the disk could seize.

True, I guess this is one important advantage of tape as backup 
media. I think tape is reliable over time not because they never 
have data loss / corriuption - they do - but because it happens 
gradually and the rate is known, so the manufacturer can just 
incorporate an error correction mechanism to compensate that 
degradation.

I guess hard disk as backup solution should be done in RAID (1, 
5, 6). Probably can be added to the presentation slide as well.

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