Date: Mon, 08 Sep 1997 16:52:03 -0700 (PDT) From: Simon Shapiro <Shimon@i-Connect.Net> To: Greg Lehey <grog@lemis.com> Cc: Mike Smith <mike@smith.net.au>, chat@FreeBSD.ORG, hcremean@vt.edu Subject: Re: lousy disk perf. under cpu load (was IDE vs SCSI) Message-ID: <XFMail.970908165203.Shimon@i-Connect.Net> In-Reply-To: <19970909082656.57842@lemis.com>
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Hi Greg Lehey; On 08-Sep-97 you wrote: > 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 I do not remember. We used it in several Z-80 MP machines we built. That was way before 8" drives, before any PC. The machine was an S-100 multi-processor. Maybe the fact that we used the first US shipment of 64kbit DRAM on that machine will give you a clue. Micropolis was experimenting with 8" drives about a year later. --- Sincerely Yours, (Sent on 08-Sep-97, 16:48:47 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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