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From: mangler@cit-vax.Caltech.Edu (System Mangler)
Newsgroups: comp.arch
Subject: Re: Disk Striping (description and references) plus class brief
Message-ID: <3872@cit-vax.Caltech.Edu>
Date: Thu, 3-Sep-87 04:21:00 EDT
Article-I.D.: cit-vax.3872
Posted: Thu Sep  3 04:21:00 1987
Date-Received: Sat, 5-Sep-87 10:04:45 EDT
References: <cV=3A8y00UoB0qA0AT@andrew.cmu.edu> <414@astroatc.UUCP> <12718@amdahl.amdahl.com>
Organization: California Institute of Technology
Lines: 14
Summary: doubling times

In article <12718@amdahl.amdahl.com>, chuck@amdahl.amdahl.com (Charles Simmons) writes:
> I was under the impression that not only did silicon memory double
> in capacity every two years, but magnetic memory also doubled in
> capacity every two years as well.

Dynamic RAM chips have gone from 1 kilobit in 1971 to 1 megabit in 1986,
a doubling time of 1.5 years.  Disks take more like 4 years to double in
capacity.  (They are simultaneously getting more compact and cheaper).

The cross-over point should be about 1995, when a 64-Mbit RAM chip
will be an inch square and cost $2, while a 2-gigabyte 3.5-inch disk
will cost $2000.

Don Speck   speck@vlsi.caltech.edu  {amdahl,rutgers}!cit-vax!speck