Description of problem: I have some DVD-ROMs that I burned using dvdrecord on an ISO-9660 image I created with K3B. Upon inserting them, I am greeted with the message: Error mounting: mount: block device /dev/sr0 is write-protected, mounting read-only mount: wrong fs type, bad option, bad superblock on /dev/sr0, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so and the discs are not automatically mounted. However, there appears to be nothing wrong with them: they can be read without problem on other operating systems. Moreover, I can mount the discs manually and read them fine. At no point do I see any I/O error messages in dmesg. Output of udevadm monitor : monitor will print the received events for: UDEV - the event which udev sends out after rule processing KERNEL - the kernel uevent KERNEL[1314356104.186242] change /devices/pci0000:00/0000:00:1f.1/host3/target3:0:0/3:0:0:0/block/sr0 (block) UDEV [1314356104.381819] change /devices/pci0000:00/0000:00:1f.1/host3/target3:0:0/3:0:0:0/block/sr0 (block) KERNEL[1314356116.180650] change /devices/pci0000:00/0000:00:1f.1/host3/target3:0:0/3:0:0:0/block/sr0 (block) UDEV [1314356119.373916] change /devices/pci0000:00/0000:00:1f.1/host3/target3:0:0/3:0:0:0/block/sr0 (block) Output of blkid -p -o udev /dev/sr0 : ID_FS_VERSION=Joliet\x20Extension ID_FS_LABEL=USA_Trip_2011 ID_FS_LABEL_ENC=USA\x20Trip\x202011 ID_FS_TYPE=iso9660 ID_FS_USAGE=filesystem Output of cd-info --dvd /dev/sr0: cd-info version 0.82 x86_64-redhat-linux-gnu Copyright (c) 2003, 2004, 2005, 2007, 2008 R. Bernstein This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. CD location : /dev/sr0 CD driver name: GNU/Linux access mode: ioctl Vendor : Optiarc Model : DVD RW AD-7590A Revision : 1.05 Hardware : CD-ROM or DVD Can eject : Yes Can close tray : Yes Can disable manual eject : Yes Can select juke-box disc : No Can set drive speed : No Can read multiple sessions (e.g. PhotoCD) : Yes Can hard reset device : Yes Reading.... Can read Mode 2 Form 1 : Yes Can read Mode 2 Form 2 : Yes Can read (S)VCD (i.e. Mode 2 Form 1/2) : Yes Can read C2 Errors : Yes Can read IRSC : Yes Can read Media Channel Number (or UPC) : Yes Can play audio : Yes Can read CD-DA : Yes Can read CD-R : Yes Can read CD-RW : Yes Can read DVD-ROM : Yes Writing.... Can write CD-RW : Yes Can write DVD-R : Yes Can write DVD-RAM : Yes Can write DVD-RW : No Can write DVD+RW : No __________________________________ Disc mode is listed as: DVD-R CD-ROM Track List (1 - 1) #: MSF LSN Type Green? Copy? 1: 00:02:00 000000 data false no 170: 95:59:74 431849 leadout (968 MB raw, 843 MB formatted) __________________________________ CD Analysis Report CD-ROM with ISO 9660 filesystem and joliet extension level 3 ISO 9660: 1554521 blocks, label `USA Trip 2011 ' Application: K3B THE CD KREATOR (C) 1998-2010 SEBASTIAN TRUEG AND MICHAL MALEK Preparer : Publisher : System : LINUX Volume : USA Trip 2011 Volume Set : Version-Release number of selected component (if applicable): udev-167-4.fc15.x86_64 udisks-1.0.2-4.fc15.x86_64 k3b-2.0.2-4.fc15.x86_64
OK, so this seems to have cleared up after a reboot, having been consistently reproducible before. Maybe something spooked udev during the burn process...
commands to run for debugging: # udevadm info --query=all --name=/dev/sr0 # /lib/udev/cdrom_id --debug /dev/sr0 # blkid -p -o udev /dev/sr0
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