From owner-freebsd-questions Fri Mar 30 12:51: 8 2001 Delivered-To: freebsd-questions@freebsd.org Received: from mail.enteract.com (mail.enteract.com [207.229.143.33]) by hub.freebsd.org (Postfix) with ESMTP id 3612037B718 for ; Fri, 30 Mar 2001 12:51:06 -0800 (PST) (envelope-from dscheidt@tumbolia.com) Received: from shell-3.enteract.com (dscheidt@shell-3.enteract.com [207.229.143.42]) by mail.enteract.com (8.11.1/8.11.2) with ESMTP id f2UKosN88529; Fri, 30 Mar 2001 14:51:04 -0600 (CST) (envelope-from dscheidt@tumbolia.com) Date: Fri, 30 Mar 2001 14:50:53 -0600 (CST) From: David Scheidt X-Sender: dscheidt@shell-3.enteract.com To: Wayne Pascoe Cc: freebsd-questions@freebsd.org Subject: Re: SCSI Cd-writer In-Reply-To: Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On 30 Mar 2001, Wayne Pascoe wrote: :Well, I fixed the problem, or so I thought. I bought an HP 9600 SCSI :writer and an Adaptec 2930U controller. : :Installed fine, cdrecord --scanbus shows the device at 0,0,0 (which is :fine since the device is at id 0). : :First burn created a coaster. Second burn succeeded. But at the end it :said :min full 37% :which sounds DANGEROUSLY close to a buffer underrun. : :Is there anything that I can do to stop making coasters? Did I buy a :lemon? :( cdrecord has an fs=# option, which lets you set the size of the ring buffer it uses for the writer process. The default is 4MB, try increasing it to 8MB (fs=8m ). As long as cdrecord says that the fifo is 0 times empty, you should be okay. If you need a buffer bigger than 10 or 12 MB, there's something wrong -- quite possibly that your disks can't keep up. If you're piping the output of mkisofs to cdrecord, try using a file instead. Failing that, reduce the speed you try and burn at. David Scheidt -- dscheidt@tumbolia.com Bipedalism is only a fad. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message