Hi, it is not a bug but a feature. In the context of the cdrecord emulation being "blank" means being writable without further precautions. The media types DVD-RAM, DVD+RW, BD-RE, and formatted DVD-RW are overwritable without the need for a blanking run.
If you run xorriso in its native mode: xorriso -outdev /dev/sr0 -toc then you will probably see either Media status : is written , is appendable or Media status : is written , is closed depending on whether an ISO 9660 filesystem is recognized or not. An overwritable medium will be considered to be blank only if it is unused, or its first 64 KiB are all 0, or if it bears an ISO 9660 superblock which was invalidated by xorriso command -blank. The difference between both modes comes from the fact that xorrecord does not care for the kind of content, whereas xorriso's native mode is specialized on working with ISO 9660 filesystems on all kinds of media. The cdrecord usage model is inspired by CD-R media, which have three possible states of writablility and readability: blank, appendable, closed. (I.e. no reading, reading and writing, reading only.) Somehow xorrecord has to squeeze the states of other optical media into this model. The behavior of wodim and older cdrecord is not appropriate for overwritable media. It tells that the medium is fully written (and not supported): $ wodim dev=/dev/sr4 -toc ... wodim: Found unsupported DVD-RAM media. ... first: 1 last 1 track: 1 lba: 0 ( 0) 00:02:00 adr: 1 control: 4 mode: -1 track:lout lba: 2236704 ( 8946816) -1:59:74 adr: 1 control: 4 mode: -1 Old cdrecord-2.01.01a64 reports WARNING: Phys disk size 2314080 differs from rzone size 2236704! Prerecorded disk? WARNING: Phys start: 200704 Phys end 2514783 first: 1 last 1 track: 1 lba: 0 ( 0) 00:02:00 adr: 1 control: 4 mode: -1 track:lout lba: 2236704 ( 8946816) -1:59:74 adr: 1 control: 4 mode: -1 Both is not helpful when a user or program wants to know what must be done to make the medium writable. On sequential media there is no such ambiguity: CD-R, unformatted CD-RW, DVD+R, DVD-R, BD-R (if not formatted to Pseudo-Overwrite). Have a nice day :) Thomas
