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Article #68837

Re: Backing up to DC-ROM? Help!

#68837
From: J A F Bradbury
Date: Wed, 24 Apr 1996 00:00
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I wouldn't use it as principal backup medium. Use something like DAT 
as the primary, then CD-R for archivable & distributable material.

- DAT can run happily unattended & fast; HP-C1533A is a fast ~45MB.

CD-R Probs?
o You need 650MB /contiguous/ disk space free :)

o CD-Rs have a nasty habit of poor SCSI disconnect/connect, which when
  doing concurrent TRs can make a very fast h/d, not quite so fast.
  ( Try SCSI Bench, h/d alone, then with a CD/PD or CD-R ):
  Putting a CD-R on it's own i/f solves this.

o CD-Rs aren't as robust/long-lived as their pressed variety.

o Writing them is tedious, a verify pass is a must. 
  Mistakes are tedious & the cost does mount.

o Economically CD-R is a write-once miserly 650MB, with multi-session
  carrying a ~50MB overhead. One 90m DAT tape: 4000MB rewritable @7ukp.

For security, look at PD drives, or the "new" IBM 650MB M.O. drive,
or the new large and "interestingly priced" M.O. drives.

The decision does come down to what data is going on the CD-R, how
often it is accessed or distributed. CD-R *IS* online, DAT isn't :(
The decision is likely to be greyish :)
-- 
Julian AF Bradbury           Ergonomist; Human Factors & IT Specialist
Ergonomics, VDU & IT FAQs                 http://webzone1.co.uk/www/3b
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From: J A F Bradbury <Julian@xabcs.demon.co.uk>
Subject: Re: Backing up to DC-ROM?  Help!
Date: 1996/04/24
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