Hi, > Once again, it seems xorriso is to the rescue:
I like your attitude towards xorriso, but in this case there is a misunderstanding: BD-RE do not get blanked like CD-RW or DVD-RW. xorriso just tries to handle all media types uniformly under the premise that ISO 9660 filesystems shall to be their content. It presents BD-RE in a very similar way as BD-R but that is an artificial emulation. The first ISO 9660 session and the update "sessions" get arranged on the random-access media in a recognizable chain of mountable images. This works with plain files or USB sticks, too. So this is emulated: > Media status : is written , is appendable > Media summary: 1 session, 12075457 data blocks, 23.0g data, 25.1m free Not much room to add more sessions, but it would have worked. > $ xorriso -dev /dev/sr1 -blank "deformat" > [..about 15 seconds passes..] > Media status : is blank > > Does such a short blanking time seem to be correct? It takes much > longer to fully blank even a CD-RW disc, for example. This just defaced the existing ISO 9660 filesystem PVD (a part of the equivalent of a super block). The 15 seconds were needed to read a few kB from media, to replace two byte by 'X', and to write the few kB back to media. You will now get from: dd if=/dev/sr1 bs=2048 skip=16 count=1 | \ od -c | \ head -1 something like 0000000 001 C D X X 1 ...more bytes... whereas you see in a valid ISO filesystem 0000000 001 C D 0 0 1 ...more bytes... You may as well be brutal and bonk 64 kB of zeros onto the start of the media: dd if=/dev/zero of=/dev/sr1 bs=64K count=1 As you can see, you don't need a burn program for BD-RE. They are just much too slow for normal filesystems. The wear patterns of sequential archivers or burn programs are more appropriate for them. Have a nice day :) Thomas -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected]
