RE: "Semi-Hot-Swap" of IDE discs (OT) - dvd
> -----Original Message-----
> From: Alvin Oga [mailto:aoga@Maggie.Linux-Consulting.com]
> Sent: 19 June 2002 12:55
> To: Ron Johnson
> Cc: Debian-User
> Subject: Re: "Semi-Hot-Swap" of IDE discs (OT) - dvd
>
>
>
> hi ya
>
> > > Don't tapes get torn, munched and demagnetized?
>
> be more careful in handling and storage ??
>
> > It's been years since I've seen that, but _maybe_ (or maybe not)
> > that's because I shell out USD3,000 for a DLT drive and
> USD60 for DLT
> > tapes... I'm sure AIT has the same quality.
>
> and yes... a "good" drive helps...
>
> > > Why not do backups on CD-R/RW?
> >
> > Hmmm. Let's see:
> > Max uncompressed storage on CD: 700MB
> > Max Uncompressed storage on tape: 110,000MB (SuperDLT)
I've just taken delivery of a twin-drive 16-bay AIT3 library. Total capacity
- 4160 Gigabytes. The 260GB tapes are £90 each. Now /this/ is a backup
solution.
Cost per megabyte (CDRW):
Assume a cost of £2.50 for a single blank CDRW of quality.
Assume 800MB of data written, given a reasonable compression ratio.
So each megabyte of data costs 0.31 pence (that's £3.20 per gigabyte)
Cost per megabyte (DLT):
Assume a cost of £50.00 for a single blank DLT4 cartridge of quality.
Assume 60GB of data written (DLT8000, 40/80GB), given a reasonable but not
perfect compression ratio.
Each megabyte of data costs 0.081 pence (That's 81p a gigabyte).
> dvd's are good up to about 4GB.... abnd some newer ones
> just announced are good for 100GB ...
> probably will be cheaper to get bunch of 100GB ide disks
> for $100 each than those 100GB dvd drives..
CD/DVD is NOT COST-EFFECTIVE as a backup strategy. Never mind the
unreliability, the short lifespan of the media and the low speed.
>
> -- opps, took out too much of the who said what part... oh well..
Please be more careful with attributions in future.
> c ya
> alvin
Regards,
Peter.
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