From owner-freebsd-questions@FreeBSD.ORG Sun Jul 29 20:45:48 2007 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 1923B16A419 for ; Sun, 29 Jul 2007 20:45:48 +0000 (UTC) (envelope-from youshi10@u.washington.edu) Received: from mxout7.cac.washington.edu (mxout7.cac.washington.edu [140.142.32.178]) by mx1.freebsd.org (Postfix) with ESMTP id E753E13C483 for ; Sun, 29 Jul 2007 20:45:47 +0000 (UTC) (envelope-from youshi10@u.washington.edu) Received: from smtp.washington.edu (smtp.washington.edu [140.142.32.139]) by mxout7.cac.washington.edu (8.13.7+UW06.06/8.13.7+UW07.06) with ESMTP id l6TKjlhG031130 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Sun, 29 Jul 2007 13:45:47 -0700 X-Auth-Received: from [192.168.10.45] (c-24-10-12-194.hsd1.ca.comcast.net [24.10.12.194]) (authenticated authid=youshi10) by smtp.washington.edu (8.13.7+UW06.06/8.13.7+UW07.03) with ESMTP id l6TKjkOa012261 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT); Sun, 29 Jul 2007 13:45:46 -0700 Message-ID: <46ACFC7A.7040601@u.washington.edu> Date: Sun, 29 Jul 2007 13:45:46 -0700 From: Garrett Cooper User-Agent: Thunderbird 2.0.0.5 (Windows/20070716) MIME-Version: 1.0 To: "illoai@gmail.com" References: <46ACF219.8010903@walsimou.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-PMX-Version: 5.3.2.304607, Antispam-Engine: 2.5.1.298604, Antispam-Data: 2007.7.29.132033 X-Uwash-Spam: Gauge=IIIIIII, Probability=7%, Report='__CT 0, __CTE 0, __CT_TEXT_PLAIN 0, __HAS_MSGID 0, __MIME_TEXT_ONLY 0, __MIME_VERSION 0, __SANE_MSGID 0, __USER_AGENT 0' Cc: Gaye Abdoulaye Walsimou , freebsd-questions@freebsd.org, Soo-Hyun Choi Subject: Re: IDE cable? 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: Sun, 29 Jul 2007 20:45:48 -0000 illoai@gmail.com wrote: > On 29/07/07, Gaye Abdoulaye Walsimou wrote: > >> Soo-Hyun Choi a écrit : >> >>> Hi, >>> >>> This might be out of the scope in this list. But, would someone be able to >>> tell me if an IDE cable for HDD and for CD-ROM is identical or not? >>> >>> Thanks, >>> >>> >>> >>> >> The same yes >> >> > > With the aside that on some older machines the > cdrom cable is 40 conductor which if used with > a faster hard drive will prevent it from running > above UDMA33 (I believe). But it will work. Yes, that's true because pin-80 is twisted data/ground pairs which reduce crosstalk on the wires, thus allow the wiring to push UDMA133 (133MHz), a value 4 times higher than the 40-pin max value. CD-ROM drives generally don't go above 66MHz though from my experience. You can determine if the cables are equivalent by noting the wire width (easy because the wire widths are about double), or wire count (there will be 40-pin or 80-pin). The number of pins on the PATA interface isn't different though, so comparing that way won't change things. If you're concerned about speed and/or signal quality, you may want to make sure that the cable isn't kinked at all. That will result in either slowdowns or failures due to data corruption. Cheers, -Garrett