From owner-freebsd-chat Mon Sep 8 16:51:46 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.7/8.8.7) id QAA16577 for chat-outgoing; Mon, 8 Sep 1997 16:51:46 -0700 (PDT) Received: from sendero-ppp.i-connect.net (sendero-ppp.i-Connect.Net [206.190.143.100]) by hub.freebsd.org (8.8.7/8.8.7) with SMTP id QAA16563 for ; Mon, 8 Sep 1997 16:51:42 -0700 (PDT) Received: (qmail 21533 invoked by uid 1000); 8 Sep 1997 23:52:03 -0000 Message-ID: X-Mailer: XFMail 1.2-alpha [p0] on FreeBSD X-Priority: 3 (Normal) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 8bit MIME-Version: 1.0 In-Reply-To: <19970909082656.57842@lemis.com> Date: Mon, 08 Sep 1997 16:52:03 -0700 (PDT) Organization: Atlas Telecom From: Simon Shapiro To: Greg Lehey Subject: Re: lousy disk perf. under cpu load (was IDE vs SCSI) Cc: Mike Smith , chat@FreeBSD.ORG, hcremean@vt.edu Sender: owner-freebsd-chat@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk 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