Date: Tue, 9 Sep 1997 09:57:01 +0930 From: Greg Lehey <grog@lemis.com> To: Simon Shapiro <Shimon@i-Connect.Net> 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: <19970909095701.10527@lemis.com> In-Reply-To: <XFMail.970908165203.Shimon@i-Connect.Net>; from Simon Shapiro on Mon, Sep 08, 1997 at 04:52:03PM -0700 References: <19970909082656.57842@lemis.com> <XFMail.970908165203.Shimon@i-Connect.Net>
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On Mon, Sep 08, 1997 at 04:52:03PM -0700, Simon Shapiro wrote: > > 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. Sounds like about 1980. Greg
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