From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263017AbVFXDLL (ORCPT ); Thu, 23 Jun 2005 23:11:11 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263020AbVFXDLC (ORCPT ); Thu, 23 Jun 2005 23:11:02 -0400 Received: from cpu1185.adsl.bellglobal.com ([207.236.110.166]:61712 "EHLO mail.rtr.ca") by vger.kernel.org with ESMTP id S263017AbVFXDJE (ORCPT ); Thu, 23 Jun 2005 23:09:04 -0400 Message-ID: <42BB794B.6080109@rtr.ca> Date: Thu, 23 Jun 2005 23:08:59 -0400 From: Mark Lord User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.7) Gecko/20050420 Debian/1.7.7-2 X-Accept-Language: en, en-us MIME-Version: 1.0 To: Krzysztof Oledzki Cc: Jeff Garzik , linux-kernel@vger.kernel.org, linux-ide@vger.kernel.org Subject: Re: SATA speed. Should be 150 or 133? References: In-Reply-To: Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org True SATA drives ignore the "transfer speed", as it really is meaningless and does not apply. But most (all?) first-gen SATA drives are really PATA drives with a SATA bridge built-in. Some of those drives require that Linux set the DMA transfer speed for them to work reliably. Last I looked, the highest valid PATA transfer speed was still "UDMA/133". 150 just plain doesn't exist for PATA (and the whole concept doesn't exist for SATA, so ..) Cheers