Make dd create image of certain size:
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You can make dd copy only part of a drive to an image of a size less then the full drive.
Make sure no partitions get cut off at the file size limit, use a software like gparted to move or shrink partitions to first in first part of drive before your size cut off.
To calculate size, take 1024 and times it my the number of gigabytes you want (or do less then 1024 if the image is within MB's). and use that I as the count number.

For example if you want 50GB img file, have 51200 (1024 X 50) as your count number.
sudo dd if=/dev/sdb of="/media/user/externel_drive/my_disk.img" bs=1M count=51200 status=progress


Date Created: January 19th 2022