Hi, > So it certainly sees /some/ of the UDF info. Gack!
It would be quite some strange incident if a zeroed block at a more or less random address would make this all a valid empty UDF filesystem. I am not sure whether the empty mount directory is really caused by the altered block(s). Maybe there is more than one problem at work here. > FWIW the drive is connected via USB: This is sometimes a reason for poor write performance. But 0.7x effective speed is normal for "2x" BD media if Defect Management is enabled. USB is not generally known to alter data during transmission. So for now i would rather suspect the drive's firmware. If other BD media show silent alterations too, then make tests with an USB memory stick on the same USB socket. (Again: It would be interesting to learn whether there are more zeroed blocks on the media.) Have a nice day :) Thomas -- To UNSUBSCRIBE, email to cdwrite-requ...@other.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@other.debian.org