From owner-freebsd-questions Thu Oct 25 2:59:25 2001 Delivered-To: freebsd-questions@freebsd.org Received: from logicalhost.com (logicalhost.com [63.169.206.2]) by hub.freebsd.org (Postfix) with ESMTP id 2E61437B401 for ; Thu, 25 Oct 2001 02:59:23 -0700 (PDT) Received: from colt.ncptiddische.net (ppp-176.wobline.de [212.68.69.184]) by logicalhost.com (8.11.6/8.11.6) with ESMTP id f9PA1WR97415 for ; Thu, 25 Oct 2001 06:01:32 -0400 (EDT) Received: from howie.ncptiddische.net (howie.ncptiddische.net [192.168.0.3]) by colt.ncptiddische.net (8.11.6/8.11.6) with ESMTP id f9PA1tx48880 for ; Thu, 25 Oct 2001 12:01:56 +0200 (CEST) (envelope-from nils@tisys.org) Received: from howie.ncptiddische.net (howie.ncptiddische.net [192.168.0.3]) by howie.ncptiddische.net (8.11.6/8.11.6) with ESMTP id f9PA0hH00258 for ; Thu, 25 Oct 2001 12:00:44 +0200 (CEST) (envelope-from nils@tisys.org) Date: Thu, 25 Oct 2001 12:00:43 +0200 (CEST) From: Nils Holland X-X-Sender: nils@howie.ncptiddische.net To: freebsd-questions@freebsd.org Subject: UDMA66 - One cable, two modes? Message-ID: <20011025115305.E240-100000@howie.ncptiddische.net> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG Hi all, reading through my /var/log/messages I just noted something that caught my attention because it seems strange to me. Have a look at the following any pay attantion to the two hard disks on ata0: Oct 24 15:56:31 howie /kernel: ad0: 12416MB [25228/16/63] at ata0-master UDMA66 Oct 24 15:56:31 howie /kernel: ata0-slave: DMA limited to UDMA33, non-ATA66 compliant cable Oct 24 15:56:31 howie /kernel: ad1: 8063MB [16383/16/63] at ata0-slave UDMA33 Oct 24 15:56:31 howie /kernel: acd0: CDROM at ata1-master using PIO4 Oct 24 15:56:31 howie /kernel: acd1: CD-R at ata1-slave using PIO3 What does this tell us? Well, the primary master, a Western Digital hard disk, is correctly initialized to use UDMA66. However, the primary slave, which is a UDMA66-compliant drive made by Fujitsu is only using UDMA33. That is justified by the message saying that the ata0-slave cable is not UDMA66-complaint. Now ... how can that be? The cable to which both of these hard disks are conencted is the same one, as both are connected to the primary port. So, how can the first drive work at UDMA66, while the slave complains about a non-compliant cable? The only thing that comes to my mind trying to explain this is that it's probably not the cable causing the problem, but the IDE controller on the mainboard. Still, any comments on this are welcome! Greetings Nils Nils Holland Ti Systems - FreeBSD in Tiddische, Germany http://www.tisys.org * nils@tisys.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message