TK-70 vs. reel-to-reel storage

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Article #5397

#5397

From: William S. Sinclair
Date: Thu, 25 May 1989 21:00

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I am puzzled by the difference in storage capabilities between the two.
The little TK-70 can hold 296 MB of data, as compared to only 140 MB
for the reel-to-reel at 6250 BPI. Some simple computations reveal that
the reel-to-reel has about TWICE the media storage area. So assuming that
both storage technologies are about state-of-the-art, why can't the 6250
BPI reel-to-reel hold about twice as much, rather than only half?
The TK-70's are 600 feet long by 1 inch wide, which is 7200 sq. inches,
while the reel-to-reels are 2400 feet by 1/2 inch wide= 14400 sq. inches.

Bill S.

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!apple!ames!elroy!aero!sinclair
From: sinclair@aerospace.aero.org (William S. Sinclair)
Newsgroups: comp.sys.dec
Subject: TK-70 vs. reel-to-reel storage
Message-ID: <51900@aerospace.AERO.ORG>
Date: 25 May 89 21:00:54 GMT
Reply-To: sinclair@aero.UUCP (William S. Sinclair)
Distribution: usa
Organization: The Aerospace Corporation, El Segundo, CA
Lines: 10