From owner-freebsd-chat Mon Sep 8 00:37:55 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.7/8.8.7) id AAA15643 for chat-outgoing; Mon, 8 Sep 1997 00:37:55 -0700 (PDT) Received: from nico.telstra.net (nico.telstra.net [139.130.204.16]) by hub.freebsd.org (8.8.7/8.8.7) with SMTP id AAA15634 for ; Mon, 8 Sep 1997 00:37:52 -0700 (PDT) Received: from freebie.lemis.com (gregl1.lnk.telstra.net [139.130.136.133]) by nico.telstra.net (8.6.10/8.6.10) with ESMTP id RAA07428; Mon, 8 Sep 1997 17:36:49 +1000 Received: (grog@localhost) by freebie.lemis.com (8.8.7/8.6.12) id RAA27193; Mon, 8 Sep 1997 17:06:38 +0930 (CST) Message-ID: <19970908170637.25473@lemis.com> Date: Mon, 8 Sep 1997 17:06:37 +0930 From: Greg Lehey To: Mike Smith Cc: hcremean@vt.edu, chat@FreeBSD.ORG Subject: Re: lousy disk perf. under cpu load (was IDE vs SCSI) References: <19970908024325.42427@wakky.dyn.ml.org> <199709080628.QAA01795@word.smith.net.au> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.81e In-Reply-To: <199709080628.QAA01795@word.smith.net.au>; from Mike Smith on Mon, Sep 08, 1997 at 04:28:40PM +1000 Organisation: LEMIS, PO Box 460, Echunga SA 5153, Australia Phone: +61-8-8388-8250 Fax: +61-8-8388-8250 Mobile: +61-41-739-7062 WWW-Home-Page: http://www.lemis.com/~grog Fight-Spam-Now: http://www.cauce.org Sender: owner-freebsd-chat@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk 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