From owner-freebsd-questions@FreeBSD.ORG Fri Feb 13 06:58:48 2004 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id EF60616A4CE for ; Fri, 13 Feb 2004 06:58:48 -0800 (PST) Received: from mail1.speakeasy.net (mail1.speakeasy.net [216.254.0.201]) by mx1.FreeBSD.org (Postfix) with ESMTP id D9C8C43D1D for ; Fri, 13 Feb 2004 06:58:48 -0800 (PST) (envelope-from jdarnold@buddydog.org) Received: (qmail 25976 invoked from network); 13 Feb 2004 14:58:48 -0000 Received: from dsl092-076-225.bos1.dsl.speakeasy.net (HELO buddydog.org) ([66.92.76.225]) (envelope-sender ) by mail1.speakeasy.net (qmail-ldap-1.03) with SMTP for ; 13 Feb 2004 14:58:48 -0000 Message-ID: <402CE627.4020809@buddydog.org> Date: Fri, 13 Feb 2004 09:58:47 -0500 From: Jonathan Arnold User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.7a) Gecko/20040119 MultiZilla/1.6.0.0e X-Accept-Language: en-us, en, ja MIME-Version: 1.0 To: freebsd-questions@FreeBSD.ORG References: In-Reply-To: Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: Why would drive run at UDMA33? (Segate 80GB) X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 13 Feb 2004 14:58:49 -0000 (Still going through some old messages, but this thread had some misconceptions and myths that I'd like to straighten out): > ATA channel 0: > Master: ad0 ATA/ATAPI rev 5 > Slave: acd0 ATA/ATAPI rev 0 > ATA channel 1: > Master: ad2 ATA/ATAPI rev 6 > Slave: no device present > > Here is your problem. On channel 0 You have an UDMA100 disk and an > UDMA33 cd-rw. The motherboard IDE controller steps down the speed to > the speed of the slowest device. You have to move the cd-rw device This is not true. With today's computers, all disks will operate at their highest speed, not matter what other device they are paired with. Their transfer rate may be slowed down if *both* devices are accessed at the exact same time, but that's nothing to worry about generally. So just because you have a CD-ROM and an UDMA100 disk on the same channel, it doesn't mean the UDMA100 disk will be slowed in nearly any noticable fashion. Also mentioned in this thread was something about the cable being connected "backwards". There is no "motherboard" and "disk" connecting direction in an IDE cable, be it a reguler one or a UDMA 100 one. Cables are made to be a little more convenient if you hook them up the "right" way (with two connectors closer together at one end), but it has no bearing on the speed or the UDMA detected. -- Jonathan Arnold (mailto:jdarnold@buddydog.org) Daemon Dancing in the Dark, a FreeBSD weblog: http://freebsd.amazingdev.com/blog/