Date: Sat, 1 Aug 1998 12:53:57 -0700 (PDT) From: Scott <scott@SchematiX.net> To: "Louis A. Mamakos" <louie@TransSys.COM> Cc: Nathan Dorfman <nathan@fcc.net>, Andrew Bromage <bromage@queens.unimelb.edu.au>, freebsd-stable@FreeBSD.ORG Subject: Re: CD writers as a backup medium Message-ID: <Pine.BSF.4.01.9808011250350.295-100000@SchematiX.net> In-Reply-To: <199808011928.PAA12685@whizzo.transsys.com>
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On Sat, 1 Aug 1998, Louis A. Mamakos wrote:
>
> > tapes may be 4GB, but most of them are extremely slow compared to a CD-R.
> > Even some of the fastest tape drives aren't as fast as a 4x CD-R (last
> > time i checked). Tape drives are also a lot more expensive and the tapes
> > are EXTREMELY expensive. CD-R disk can be found for $1 or less if you have
> > a rebate. Tapes for my TR1 drive (old; never in use anymore) are $30
> > each...and i have 5 tapes for them. So it really comes down to how much
> > money you have.
> >
>
> Sounds like you should have bought a DAT tape then.
should have but at the times i had a budget of $200
>
> A DDS-2 drive (without compression) has a 326 kByte/s transfer rate; this
> will be somewhat larger if you've got compression enabled in the drive. So
> you'll have 4 GB uncompressed on a 90 meter tape and perhaps twice that
> with compression enabled.
>
> If this is large enough to hold your dump, then in some sense you don't
> really care what the transfer rate is if you don't have to swap media.
i was only using my backups to store junk i downloaded. (Back in my
windows days)
>
> I bought a reconditioned DDS-2 changer (that holds 4 or 12 tapes depending
> on the magazine) for a bit less than $400. Media is about $7-$12 depending
> on what you find.
Thats some serious data storage. Brand new that thing would be extremely
expensive.
>
> DDS-3 increases the capacity (and thus transfer rate) again. I think the
> media cost might be a wash between CD and DAT for bulk storage. The CD
> media is less clostly, but has a factor of about 3 or 4 less capacity. The
> DAT media is resuable - sure, you can get rewritable CD media, but now the
> cost is considerably higher.
CDs are so cheap nowdays that there is no sense for a rewritable when it
would be just as quick/easy to rewrite the whole thing.
>
> Clearly the Travan drives lose on a cost measure - the drives are cheap, but
> you go broke buying the media.
you can say that again :)
>
> louie
>
-scott
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