From owner-freebsd-questions@FreeBSD.ORG Tue Feb 21 15:57:32 2012 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 1A3A2106566C for ; Tue, 21 Feb 2012 15:57:32 +0000 (UTC) (envelope-from jerrymc@gizmo.acns.msu.edu) Received: from gizmo.acns.msu.edu (gizmo.acns.msu.edu [35.8.1.43]) by mx1.freebsd.org (Postfix) with ESMTP id D4FC18FC19 for ; Tue, 21 Feb 2012 15:57:31 +0000 (UTC) Received: from gizmo.acns.msu.edu (localhost [127.0.0.1]) by gizmo.acns.msu.edu (8.13.6/8.13.6) with ESMTP id q1LFvW5i045877; Tue, 21 Feb 2012 10:57:32 -0500 (EST) (envelope-from jerrymc@gizmo.acns.msu.edu) Received: (from jerrymc@localhost) by gizmo.acns.msu.edu (8.13.6/8.13.6/Submit) id q1LFvVuV045876; Tue, 21 Feb 2012 10:57:31 -0500 (EST) (envelope-from jerrymc) Date: Tue, 21 Feb 2012 10:57:31 -0500 From: Jerry McAllister To: Robert Bonomi Message-ID: <20120221155731.GE45597@gizmo.acns.msu.edu> References: <201202211437.57176.erich@alogreentechnologies.com> <201202211239.q1LCd0eR008307@mail.r-bonomi.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <201202211239.q1LCd0eR008307@mail.r-bonomi.com> User-Agent: Mutt/1.4.2.2i Cc: freebsd-questions@freebsd.org Subject: Re: /usr/home vs /home X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 21 Feb 2012 15:57:32 -0000 On Tue, Feb 21, 2012 at 06:39:00AM -0600, Robert Bonomi wrote: > > > > > > > AHA. probably an 'RL-05', cousin to the better known "RK-05" > > I had a memory fault -- the RLs were the RL-01 and RL-02. > > > > > > 14" media, in a 'cartridge'. I -think- it was an 'SMD' interface > > > > 14" could be true as it just fitted into a 19" rack. > > Virtually all 'removable platter' or 'removable pack' storage of the day > was 14" media. :) > > There were some "high-capacity" _non-removable-media_ drives that used > much larger media. A friend had a coffee table made from a 45" disk > platter. Control Data Corp made the drives with the large platters - 45" sounds about right. It was the 808 Disk drive. It was built on a huge heavy cast aluminum frame (to counteract vibration)and the heads were 'loaded' and positioned hydraulicly. There was a large and noisy pump unit right next to it. It was quite fast at read/write. Here one was set up to only use a couple of cylinders to reduce seek time and then used as a swap disk. CDC was actually a major disk manufacturer in their day. I also used that DEC setup with the removable disk cartridges on a PDP-11 an later on a 8650. The 8650 had lots of other disk, but a cartridge was still used for the system controller that did things like controlling the boot, etc. ////jerry