1

I formatted dvd-rw disc with the following command

dvd+rw-format -blank=full /dev/sr0

If I try the command dd if=/dev/sr0 bs=2048 | hexdump -C, nothing happens.

How to verify that every bit of the disc has been erased?

3

You can use the dvd+rw-mediainfo command to see if your DVD is totally blank:

If the DVD is blank:

dvd+rw-mediainfo /dev/sr0 | grep status
Disc status:           blank

If not:

dvd+rw-mediainfo /dev/sr0 | grep status
Disc status:           complete

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