[Gllug] Viable back-up solutions for gigabytes?

[Chris Bell]

On Sun 05 Sep, adam at thebowery.co.uk wrote:
> 
> On Sun, Sep 05, 2004 at 09:05:44AM +0100, Richard Jones wrote:
> > On Sat, Sep 04, 2004 at 07:38:02PM +0100, Bernard Peek wrote:
> > > 
> > > Writeable DVD looks to be the right medium. It's simple and cheap and if 
> > > the place burns down it won't take long to get compatible hardware to 
> > > read the data back again. One disk can hold 8Gb of data and if your 
> > > daily dynamic data is less than that you can leave a machine to do an 
> > > unattended backup overnight.
> > 
> > Interesting.  Is that 8GB of real storage or compressed?
> 
> Storage on a single layer DVD is 4.7 Gigabytes (just be warned these are 
> salemens Gigabytes so are 1000 Megabytes rather than 1024 Megabytes) so 4700
> Megabytes, for a dual layer DVD you double this :)
> 
> Adam

   Reading the specs on DVD's and CD's shows that there are many variations.
Some DVD standards have dual layer DVD tracks, but many dual layer devices
seem to be a combination of DVD and CD technologies. There are also many
variations on the materials used, some of which claim a much longer
retention. You need to read the spec before purchase, and hope that the
system you choose is popular enough not to disappear as quickly as it
appears, perhaps by choosing just single layer storage. There is already
talk of using extreme blue lasers to read and write much higher densities,
which may render current devices obsolete.

-- 
Chris Bell

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