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From: franka@mmintl.UUCP (Frank Adams)
Newsgroups: comp.arch
Subject: Re: how fast could disks be (Mach 1)
Message-ID: <2316@mmintl.UUCP>
Date: Tue, 18-Aug-87 19:12:47 EDT
Article-I.D.: mmintl.2316
Posted: Tue Aug 18 19:12:47 1987
Date-Received: Sat, 22-Aug-87 14:22:15 EDT
References: <lots> <12191@amdahl.amdahl.com> <1189@k.gp.cs.cmu.edu>
Reply-To: franka@mmintl.UUCP (Frank Adams)
Organization: Multimate International, E. Hartford, CT.
Lines: 12
Keywords: laser disk scan Mach

In article <1189@k.gp.cs.cmu.edu> lindsay@k.gp.cs.cmu.edu (Donald Lindsay) writes:
>Mach 1 is irrelevant to a truly advanced read/write laser disk.
>The first commercial units will spin, but eventually, we will just scan the
>laser beam across an unmoving disk.

Doesn't this severely limit the ability to stack more than one disk surface
in a device?  How close to the disk does the scanning head have to be?  How
does this depend on the disk size?
-- 

Frank Adams                           ihnp4!philabs!pwa-b!mmintl!franka
Ashton-Tate          52 Oakland Ave North         E. Hartford, CT 06108