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Henry Huang thinks this is interesting:
md5sum dvd-image.iso; dd if=/dev/dvd bs=2048 count=$(( $(stat -c "%s" dvd-image .iso) / 2048 )) | md5sum
Minimise
md5sum dvd-image.iso; dd if=/dev/dvd bs=2048 count=$(( $(stat -c "%s" dvd-image .iso) / 2048 )) | md5sum
Minimise