From owner-freebsd-chat Mon Sep 8 15:36:53 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.7/8.8.7) id PAA10702 for chat-outgoing; Mon, 8 Sep 1997 15:36:53 -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 PAA10687 for ; Mon, 8 Sep 1997 15:36:47 -0700 (PDT) Received: (qmail 18825 invoked by uid 1000); 8 Sep 1997 21:37:07 -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: <19970908164852.40911@lemis.com> Date: Mon, 08 Sep 1997 14:37:07 -0700 (PDT) Organization: Atlas Telecom From: Simon Shapiro To: Greg Lehey Subject: Re: lousy disk perf. under cpu load (was IDE vs SCSI) Cc: hcremean@vt.edu, chat@FreeBSD.ORG, Mike Smith 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 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. > > Greg --- Sincerely Yours, (Sent on 08-Sep-97, 14:19:04 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