From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753370AbXDREkr (ORCPT ); Wed, 18 Apr 2007 00:40:47 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753208AbXDREkr (ORCPT ); Wed, 18 Apr 2007 00:40:47 -0400 Received: from terminus.zytor.com ([192.83.249.54]:43154 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753370AbXDREkq (ORCPT ); Wed, 18 Apr 2007 00:40:46 -0400 Message-ID: <46259E18.6010003@zytor.com> Date: Tue, 17 Apr 2007 21:27:04 -0700 From: "H. Peter Anvin" User-Agent: Thunderbird 1.5.0.10 (X11/20070301) MIME-Version: 1.0 To: Gene Heskett CC: lkml , Alain.Knaff@poboxes.com Subject: Re: floppy.ko References: <200704170036.00605.gene.heskett@verizon.net> <4624CECD.2070805@zytor.com> <200704172312.49787.gene.heskett@gmail.com> In-Reply-To: <200704172312.49787.gene.heskett@gmail.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Gene Heskett wrote: > On Tuesday 17 April 2007, H. Peter Anvin wrote: >> Gene Heskett wrote: >>> I have the usual fd0, a 3.5" 1.44 drive, and fd1, a 5.25" 720k drive in >>> this machine, both are enabled in the bios with the correct types being >>> set there. >> A 5.25" 720k drive?! That's not a PC standard drive -- 5.25" came in >> 180K, 360K and 1200K varieties, whereas 3.5" came in 720K, 1440K and >> 2880K varieties (not including superfloppies.) >> >> -hpa > > It sure is a std drive, Peter, although many of the later ones that were set > up as 1.2 megger's by the pc crowd who have access to a 500 kilobaud > controller, could have the 360 rpm spindle jumper'd back to 300 rpm, and when > fed with a 250 kilobaud controller (WD177x/277x/279x family, which includes > the Fujitsu MB8877), they are perfect 720k devices and are spec'ed that way > by the makers. Many of the older full height Tandon 100-4's could also step > quite a few tracks closer to the spindle & I ran them as 765k drives by using > 84 tracks. I even have a chinon that will make 86 tracks most of the time. > > These were all quite common in the middle '80's. Before your time I suspect. > I know they were quite common, but they were not a standard *PC* accessory. (FWIW, 1200K PC drives could also read/write 720K, which allowed you to use non-HD-rated media.) (And no, this wasn't "before my time".) -hpa