Date: Mon, 08 Sep 1997 18:24:23 -0700 (PDT) From: Simon Shapiro <Shimon@i-Connect.Net> To: Mike Smith <mike@smith.net.au> Cc: chat@freebsd.org, hcremean@vt.edu Subject: Re: lousy disk perf. under cpu load (was IDE vs SCSI) Message-ID: <XFMail.970908182423.Shimon@i-Connect.Net> In-Reply-To: <199709080546.PAA01604@word.smith.net.au>
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Hi Mike Smith; On 08-Sep-97 you wrote: > > > > 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. One of the early one amoung non-computer manufacturers was Priam. Another early one was Micropolis. Someone eas making an 8" FLOPPY with linear voice coil. I tore apart an early CD drive that had a linear voice coil (but these are modern day things :-) DEC shipped linear voice coil, so did IBM, CDC, etc. --- Sincerely Yours, (Sent on 08-Sep-97, 18:21:38 by XF-Mail) Simon Shapiro Atlas Telecom Senior Architect 14355 SW Allen Blvd., Suite 130 Beaverton OR 97005 Shimon@i-Connect.Net Voice: 503.643.5559, Emergency: 503.799.2313
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