Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.csd.uwm.edu!wuarchive!brutus.cs.uiuc.edu!usc!ucsd!ogccse!blake!seymour
From: seymour@blake.acs.washington.edu (Richard Seymour)
Newsgroups: comp.periphs
Subject: Re: Hard drive speeds
Message-ID: <3486@blake.acs.washington.edu>
Date: 5 Sep 89 23:18:47 GMT
References: <9864@multimax.Encore.COM> <1213@mitisft.Convergent.COM>
Reply-To: seymour@blake.acs.washington.edu (Richard Seymour)
Organization: University of Washington, Seattle
Lines: 21

In article <1213@mitisft.Convergent.COM> dold@mitisft.Convergent.COM (Clarence Dold) writes:
(actually, in MANY articles MANY people talk about)
 
>
>> If I'm not mistaken, the NEC 9 in drive does use 2 head assemblies on
>> each arm.  I'm not sure why, but its seek time does not look any
>
>Old CDC disk drives had two sets of heads per platter.  They didn't actually

Well, the Fujitsu Eagle had two heads per arm per surface
AND
an option to have 60 (yes, sixty) fixed heads mounted
on the top surface, giving you 60 tracks with no seek time
(but still rotational latency)

(then i remember our old SDS 256kw (24 bit) drum: a a conically-shaped
 magnetic surface with lots (128 or 256) of heads.  when it spun up
it would lift on the airflow -- it was the sizze of a refridgerator --
again, no seek time)
(that was  1965 technology)
-- dick seymour  @ uwaphast.bitnet