From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pat LaVarre Subject: Re: [PATCH] fix cdrom mt rainier probe Date: 13 Jul 2004 11:57:09 -0600 Sender: linux-ide-owner@vger.kernel.org Message-ID: <1089741428.3806.3.camel@patibmrh9> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Return-path: Received: from email-out1.iomega.com ([147.178.1.82]:9364 "EHLO email.iomega.com") by vger.kernel.org with ESMTP id S263769AbUGMR5M (ORCPT ); Tue, 13 Jul 2004 13:57:12 -0400 List-Id: linux-ide@vger.kernel.org To: Jens Axboe Cc: linux-ide@vger.kernel.org Jens A: --- http://www.kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.8-rc1 --- ... [PATCH] fix cdrom mt rainier probe Mt rainier probe must be deferred to media load time, since it requires a valid media (the drive may present a different capability based on what media is loaded). This fixes that for ide-cd and sr. ... --- Looks like something broke in deciding disc rewritable or not? Only for /dev/hdd PATAPI, not for /dev/scd0 USB? I see again we have rewritable by ioctl does not imply rewritable by dd and mount. I'll blog my exploration outside, then report back if I come to understand more, but specifically so far I've seen: $ uname -srm Linux 2.6.7 i686 $ sudo rrd scan /dev/scd0 is Iomega RRD 74.B rw /dev/hdd is Iomega RRD 74.B rw $ $ sudo dd of=/dev/scd0 bs=64K count=1 if=/dev/zero 1+0 records in 1+0 records out $ sudo dd of=/dev/hdd bs=64K count=1 if=/dev/zero 1+0 records in 1+0 records out $ $ uname -srm Linux 2.6.8-rc1 i686 $ sudo rrd scan /dev/scd0 is Iomega RRD 74.B rw /dev/hdd is Iomega RRD 74.B rw $ $ sudo dd of=/dev/scd0 bs=64K count=1 if=/dev/zero 1+0 records in 1+0 records out $ sudo dd of=/dev/hdd bs=64K count=1 if=/dev/zero dd: writing `/dev/hdd': Operation not permitted 1+0 records in 0+0 records out $ Pat LaVarre http://linux-pel.blog-city.com/read/728344.htm