Thus, to check whether everything was saved, I extracted the image from the dvd:
nimrodel:/Grande/imgs # dd if=/dev/hdc of=dvd 9179712+0 records in 9179712+0 records out 4700012544 bytes (4.7 GB) copied, 392.888 s, 12.0 MB/s
and compared the sizes:
4700000000 image 4700012544 dvd
# expr \( 4700000000 + 16383 \) / 16384 \* 16384
4700012544
Apparently, while being written, the image is expanded to the next
multiple of 16k (might be even 32k or 64k). A single block on DVDs is
2048 bytes, I don't remember how big a group is (data needs to be
written in groups due to error correction codes).
HTH
Matthias
--
Matthias Hopf