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The thread you linked involved cloning from a larger disk to a smaller disk. When I tried, as a test, to clone the other (first, 350GB) partition from the same source drive and to the same target, I did not get the error message. Meanwhile I had to use some cloning software by a competitor, sorry to say. Maybe I should have, if it's something similar to the one I found in this old thread. I didn't try clicking and dragging though. I got the error message when I clicked Copy partition, having selected the source partition as source and unticked the other partitions. I deleted a NTFS partition before cloning. Also, the source doesn't have a file system as it is an encrypted (Veracrypt) data partition. The source partition starts at 350GB after another 350GB partition. I guess the issue has something to do with the specific source partition. I was trying to clone (forensic clone) a 350GB partition to an empty 500GB USB drive, but I got the insufficient space message.
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