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Article #10084Re: 'Tape' Backup
From: Michael Koerner
Date: Sun, 15 Nov 1992 13:52
Date: Sun, 15 Nov 1992 13:52
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macnei@hercules.cs.uregina.ca (Mike MacNeill) writes: >Damn I hate vi. >A couple of nights ago I had a strange dream in which I was backing up my >harddrive using an LCII and a tape-recorder hooked up to the sound input >and output ports. This is quite strange as I've had a MacII since 1987 and >have no wish to downgrade yet. Today, though, while trying to stay awake >in class, I started thinking about and doing some preliminary calculations. >1) 10mb = 10240K = 10,485,760 bytes = 83,886,080 bits >2) 45 minutes = 2700 seconds >3) Therefore, you would have to be able to store and be able to read back > 31,000 bits per second. To get this idea to work you must slow down to at least 10000 bps, because you have to add redundant data by the factor of 1.5 and your (high quality !) tape deck will not allow you to record more than 15000 bps (if ever!). So forget it Michael Koerner E-Mail: skeeve@nadia.stgt.sub.org
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arc1-ca.pugleaf.net!sparky!uunet!europa.asd.contel.com!darwin.sura.net!zaphod.mps.ohio-state.edu!sol.ctr.columbia.edu!ira.uka.de!smurf.sub.org!nadia!skeeveReferences:
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Newsgroups: comp.sys.mac.apps Path: arc1-ca.pugleaf.net!sparky!uunet!europa.asd.contel.com!darwin.sura.net!zaphod.mps.ohio-state.edu!sol.ctr.columbia.edu!ira.uka.de!smurf.sub.org!nadia!skeeve From: skeeve@nadia.stgt.sub.org (Michael Koerner) Subject: Re: 'Tape' Backup References: <1992Nov12.203324.593507@sue.cc.uregina.ca> Date: Sun, 15 Nov 1992 13:52:09 GMT Organization: Stuttgart Net Systems, FRG Message-ID: <1992Nov15.135209.26562@nadia.stgt.sub.org> Lines: 24