From owner-freebsd-hardware@FreeBSD.ORG Tue Mar 10 22:08:11 2009 Return-Path: Delivered-To: freebsd-hardware@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 5D781106564A for ; Tue, 10 Mar 2009 22:08:11 +0000 (UTC) (envelope-from wowens1@qwest.net) Received: from mpls-qmqp-01.inet.qwest.net (mpls-qmqp-01.inet.qwest.net [63.231.195.112]) by mx1.freebsd.org (Postfix) with ESMTP id 3C1128FC12 for ; Tue, 10 Mar 2009 22:08:11 +0000 (UTC) (envelope-from wowens1@qwest.net) Received: from pony (216-250-178-94.dsl.iphouse.net [216.250.178.94]) by mpls-qmqp-01.inet.qwest.net (Postfix) with ESMTP id 92B431A981F for ; Tue, 10 Mar 2009 22:08:10 +0000 (UTC) From: "William Owens" To: freebsd-hardware@freebsd.org Date: Tue, 10 Mar 2009 17:08:10 -0500 Priority: normal X-mailer: Pegasus Mail for Windows (v3.12b) Message-Id: <20090310220810.92B431A981F@mpls-qmqp-01.inet.qwest.net> X-Virus-Scanned: ClamAV version 0.94.2, clamav-milter version 0.94.2 on mpls-clamav-10.inet.qwest.net X-Virus-Status: Clean Subject: parallel ata with disk and DVD-RW on same cable X-BeenThere: freebsd-hardware@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: wowens1@qwest.net List-Id: General discussion of FreeBSD hardware List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 10 Mar 2009 22:08:11 -0000 Good Day, I have long had problems with putting disk drives and old CD-ROM drives on the same parallel IDE cable and have avoided doing so with more current DVD-RW drives till now. Is this to be expected or must I presume that IDE drives and ATAPI drives just cannot coexist on the same cable? I have a particular need to put both on a single cable. Do I have a chance? Currently I have (from 'atacontrol') atacontrol reinit ata1 Master: ad2 < ATA/ATAPI revision 7 Slave: acd0 < ATA/ATAPI revision 0 Because the NEC DVD drive is capable of UDMA33 as a maximum I have tried a 40 pin cable to limit both devices to UDMA33. FreeBSD 7.1 recognizes this and prints a message. The problem exists with either 40 ping or 80 cables. If I write to the NEC DVD from the ad2 disk, both get very slow. Writing from other devices to the DVD also causes the DVD drive to sometimes get very slow ( ~ 1.3 Mb/sec ). The writing is done with 'growisofs' and uses the atapicam kernel module which turns /dev/acd0 into the SCSI device /dev/cd0. Resetting with the 'atacontrol' command brings back a more normal speed (4-9 Mb/sec) for a time. So, the question, Do I have any right to expect disk drives and DVD (atapi) drives on the same parallel cable to work? Thanks for your consideration. Will Owens