Date: Mon, 08 Sep 1997 15:46:35 +1000 From: Mike Smith <mike@smith.net.au> To: hcremean@vt.edu Cc: Simon Shapiro <Shimon@i-connect.net>, chat@freebsd.org Subject: Re: lousy disk perf. under cpu load (was IDE vs SCSI) Message-ID: <199709080546.PAA01604@word.smith.net.au> In-Reply-To: Your message of "Mon, 08 Sep 1997 01:32:27 -0400." <19970908013227.32344@wakky.dyn.ml.org>
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> > PS: When did the first voice-coil-seek hard drives come out? This is a > question that's been bugging me for some time now... Linear or rotary actuator? The linear VC actuator probably predates the use of stepper motors; certainly some of the more impressive magnets in my collection started their lives in disk units. High-precision stepper motor controls are more complex than the linear displacement sensor approach that you use with a linear VC actuator too; it's the mechanicals and the space that made steppers cheaper, AFAIK. mike
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