From owner-freebsd-questions@FreeBSD.ORG Wed Dec 8 12:21:09 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 5962A16A4CE for ; Wed, 8 Dec 2004 12:21:09 +0000 (GMT) Received: from lp1001.snu.ac.kr (lp1001.snu.ac.kr [147.46.70.11]) by mx1.FreeBSD.org (Postfix) with ESMTP id A491D43D46 for ; Wed, 8 Dec 2004 12:21:08 +0000 (GMT) (envelope-from spamrefuse@yahoo.com) Received: from [147.46.44.181] (cisr.snu.ac.kr [147.46.44.181]) (authenticated (0 bits)) by lp1001.snu.ac.kr (8.13.1/8.11.6) with ESMTP id iB8CIvn8010219 for ; Wed, 8 Dec 2004 21:18:57 +0900 Message-ID: <41B6F1AE.3000906@yahoo.com> Date: Wed, 08 Dec 2004 21:21:02 +0900 From: Rob User-Agent: Mozilla/5.0 (X11; U; FreeBSD i386; en-US; rv:1.7.3) Gecko/20041113 X-Accept-Language: en-us, en MIME-Version: 1.0 To: FreeBSD Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Subject: Harddisk speed: PIO4 vs. UDMA66 controller ? 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: Wed, 08 Dec 2004 12:21:09 -0000 Hi, I have a PII PC running 5.3. The output of 'dmesg' has a line: atapci0: [...] at device 7.1 on pci0 And at the end, it says: ad0: 43979MB [89355/16/63] at ata0-master PIO4 acd0: CDROM at ata1-master PIO4 The harddisk is very new and can do UDMA100. With a UDMA66 controller I expect the harddisk to operate at least at 66 MB/sec. Any ideas why the speed is only PIO4? Having a UDMA100 harddisk, working at PIO4 is too much of a pity, but 66 MB/sec would be OK. Thanks, Rob.