Hello, DVD-RAM disks previously made with a Linux system can no longer be mounted in RW mode. For some reason, as indicated by the error message from the mount command, the disks are detected as being write-protected (which is not the case). To be able to write to these disks, the mount command must be issued again with the "-o remount" option.
The commands given are as follows. Although the file type in this example is ext2, the same behavior is seen also with the udf file type. # modprobe ide-cd # hdparm -d1 -X udma4 -k1 /dev/hde # mount -t ext2 -o rw,noatime /dev/hde /cdrom mount: block device /dev/hde is write-protected, mounting read-only # mount -t ext2 -o remount,rw,noatime /dev/hde /cdrom Now the DVD-RAM disk can be written normally, but there should be no need for the second mount command. The kernel log for this command sequence seems to show nothing abnormal: kernel: hde: ATAPI 39X DVD-ROM DVD-R-RAM CD-R/RW drive, 2048kB Cache, UDMA(66) kernel: Uniform CD-ROM driver Revision: 3.20 kernel: hde: CHECK for good STATUS kernel: cdrom: hde: mrw address space DMA selected kernel: cdrom open: mrw_status 'not mrw' Furthermore, if I attempt to check the unmounted DVD-RAM disk with e2fsck, the drive is still reported as read-only: # e2fsck -p /dev/hde e2fsck: Read-only file system while trying to open /dev/hde Disk write-protected; use the -n option to do a read-only check of the device. However, as I indicated above, the disk is not write-protected. I am reporting this problem on the lkml because of a hint that I discovered at this link: http://lists.opensuse.org/packet-writing/2006-10/msg00000.html Although this problem does not involve packet-writing, it may be related to the cdrom code. Andrew Kalten - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
