You won’t be able to multicast if it is not scanned.
from man asr
– imagescan calculate checksums of the data in the provided image and store them in the image. These checksums are used to ensure proper restores. Also determines if the disk image is in order for multicasting, and rewrites the file in order if not. If the image has to be reordered, it will
require free disk space equal to the size of the disk image being scanned.

Cheers