Path: utzoo!attcan!uunet!tut.cis.ohio-state.edu!uc!shamash!rrr
From: rrr@u02.svl.cdc.com (Rich Ragan)
Newsgroups: comp.sys.cdc
Subject: Re: Wanted.. any info on 26" disk drive platter
Keywords: ancient,relic
Message-ID: <25833@shamash.cdc.com>
Date: 14 Sep 90 14:48:50 GMT
References: <6536@tekgen.BV.TEK.COM> <1990Sep11.034940.16212@ecn.purdue.edu> <1990Sep11.211524.2956@ultra.com> <1990Sep14.040425.21330@ecn.purdue.edu>
Sender: news@shamash.cdc.com
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I measured my 6638 platter last night. It is indeed 26" in diameter.
Therefore, the original poster must have a platter from a 6638 (808)
or the related 821 (serial). 

I heard a 6603 story (possibly apocryphal) that at some site
the heads crashed and the motors kept on turning. Supposedly
the magnesium platters soon ignited and the equivalent of
"meltdown" occurred in the computer room.

6603 Tech specs from my Kronos 2.0 instant:
Equipment Type: DA
Sectors/track : 64 outer zone
              : 50 inner zone
Tracks/device: 2048
Words/device : 7,471,104 (60 bit words)
Max data rate: 61.1K wds/sec. outer
               48.5K wds/sec inner


--
Richard R. Ragan (408) 496-4340
Control Data Corp., Silicon Valley Operations