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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

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



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