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Path: euryale.cc.adfa.oz.au!newshost.carno.net.au!harbinger.cc.monash.edu.au!news.mira.net.au!news.vbc.net!garlic.com!news.scruz.net!kithrup.com!news.Stanford.EDU!agate!howland.erols.net!EU.net!newsfeed.internetmci.com!in2.uu.net!shemesh.hq.tis.com!dira.rv.tis.com!not-for-mail From: mark@dira.rv.tis.com (Mark Sienkiewicz) Newsgroups: comp.unix.admin,comp.unix.questions,comp.unix.misc,comp.unix.bsd.bsdi.misc Subject: Re: ideal parameters for backup tape Date: 17 Sep 1996 13:07:05 -0400 Organization: Trusted Information Systems Lines: 16 Message-ID: <51mlrp$li2@dira.rv.tis.com> References: <323954B8.167EB0E7@innet.be> <323BA194.735A@top.monad.net> NNTP-Posting-Host: dira.rv.tis.com Xref: euryale.cc.adfa.oz.au comp.unix.admin:47504 comp.unix.questions:87827 comp.unix.misc:25156 comp.unix.bsd.bsdi.misc:4897 In article <323BA194.735A@top.monad.net>, Paul Venezia <pvenezia@top.monad.net> wrote: > >How much data depends on the size of the tape. A 120 meter DAT will take >approx. 8 gigs, provided you have a drive that will do compression, >such as an Archive Python. a 90 mete tape stores approx 4 gigs, >compressed. So, with the Sony, you'll get approx. 4 gigs. I've never seen 4 gig of real data stored on a 90 meter DAT -- I consistently hit end-of-tape about 3 gig into a 90 meter tape. I bet it will hold 4 billion zeros though... :) The moral of the story is don't assume the compression is going to be as effective for you as it is for the drive manufacturer. It depends a lot on the data you are storing, so you have to just try it and see.