Date: Tue, 9 Sep 1997 08:26:56 +0930 From: Greg Lehey <grog@lemis.com> To: Simon Shapiro <Shimon@i-Connect.Net> Cc: hcremean@vt.edu, chat@FreeBSD.ORG, Mike Smith <mike@smith.net.au> Subject: Re: lousy disk perf. under cpu load (was IDE vs SCSI) Message-ID: <19970909082656.57842@lemis.com> In-Reply-To: <XFMail.970908143707.Shimon@i-Connect.Net>; from Simon Shapiro on Mon, Sep 08, 1997 at 02:37:07PM -0700 References: <19970908164852.40911@lemis.com> <XFMail.970908143707.Shimon@i-Connect.Net>
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On Mon, Sep 08, 1997 at 02:37:07PM -0700, Simon Shapiro wrote: > > Hi Greg Lehey; On 08-Sep-97 you wrote: >> On Mon, Sep 08, 1997 at 03:46:35PM +1000, Mike Smith 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? >> >> I'd always equated "voice coil" with linear actuators. I'd guess the >> early 70s. We installed the first UNIVAC 8440s in 1973. I think they >> were voice coil. They looked like 3330 copies. >> >>> The linear VC actuator probably predates the use of stepper motors; >> >> I'd think so. The stepper motors wouldn't have got into hard drives >> until about the ST-506. > > The 26MB Shugart 14" drive had stepper and AC spinfle motor on a long belt. When was that introduced? Greg
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