Path: utzoo!utgpu!cunews!mitel!testeng1!stanfiel
From: stanfiel@testeng1.misemi (Chris Stanfield)
Newsgroups: comp.sys.mac.misc
Subject: Re: DAT backup for MAC?
Message-ID: <6622@testeng1.misemi>
Date: 19 Feb 91 20:57:48 GMT
References: <789@david.UUCP> <23192@well.sf.ca.us> <10851@jarthur.Claremont.EDU>
Reply-To: stanfiel@testeng1.UUCP ()
Organization: Mitel CAE Services
Lines: 22

In article <10851@jarthur.Claremont.EDU> epan@jarthur.Claremont.EDU (Eric C. Pan) writes:
>
>p.s. I believe the 10mg/tape capacity Charlie quoted is based on hardware
>compression and not the "real" or "raw" storage capacity of DAT tapes.
I would have thought that the data capacity of a DAT tape would be
similar to that of a CD. If I have got my math right, that would be
(for tape that couls hold 1 hour of audio):

	sample rate = app. 50 kHz per channel, two channels, 8 bit
coding (i.e. byte encoding)

		= 100,000 samples/sec*60*60
		= 360 M samples, which is 360 Mb of data

This is, of course, raw, unformatted capacity, but I don't see any
reason why you shouldn't be able to get 256 Mb of data onto a tape.

Am I missing something?

Chris Stanfield, Mitel Corporation: E-mail to:- uunet!mitel!testeng1!stanfiel
(613) 592 2122 Ext.4960
We do not inherit the world from our parents - we borrow it from our children.