Date: Mon, 8 Sep 1997 17:06:37 +0930 From: Greg Lehey <grog@lemis.com> To: Mike Smith <mike@smith.net.au> Cc: hcremean@vt.edu, chat@FreeBSD.ORG Subject: Re: lousy disk perf. under cpu load (was IDE vs SCSI) Message-ID: <19970908170637.25473@lemis.com> In-Reply-To: <199709080628.QAA01795@word.smith.net.au>; from Mike Smith on Mon, Sep 08, 1997 at 04:28:40PM %2B1000 References: <19970908024325.42427@wakky.dyn.ml.org> <199709080628.QAA01795@word.smith.net.au>
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On Mon, Sep 08, 1997 at 04:28:40PM +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? 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. >> >> Makes sense...I had an old (1985) Seagate ST-4026 that used linear seek, and >> the magnets in it were HUGE. There's also a Hitachi DK511-8 here, of about >> the same vintage, that uses rotary voice-coil. > > I was talking pre-1980 stuff; you would have to find a real fossil to > tell you what they were using before that. 8) Thanks. The 2311 used hydraulics. Didn't I offer you the manual? Anyway, it's somewhere in the shed. 70ms average positioning IIRC. The typical start to a bad day was to come in and find a pool of oil under one of your disk drives. Greg
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