How to open UDF Volume

Solution 1:

Open the terminal and try mounting the DVD with:

sudo mount -t udf /dev/sr0 /cdrom

The argument following the -t is used to indicate the filesystem type, which in this case is udf. UDF or Universal Disk Format is an operating-system-independent file system commonly used on DVD and other digital media.¹

¹_{https://en.wikipedia.org/wiki/UDF}

Solution 2:

Not all DVDs are really udf, if the -t udf doesn't work (wrong superblock) try:

sudo mount -t iso9660 /dev/sr0 /cdrom

that is after sudo mkdir /cdrom so the /cdrom directory exists.

~$ sudo mount -t udf /dev/sr0 /cdrom
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

~$ sudo mount -t iso9660 /dev/sr0 /cdrom
mount: block device /dev/sr0 is write-protected, mounting read-only
~$ ls /cdrom
autorun.inf  casper  EFI      isolinux    pics  preseed             ubuntu
boot         dists   install  md5sum.txt  pool  README.diskdefines  wubi.exe

*Yet it is a DVD+R