If it was a permissions thing, make sure you right click and run as administrator.
Would it allow windows to move linux files around freely? Cuz it was trying to defrag my mint backup but all the files I could tell were locked to everyone.
What does EXT4 do?
it does file managing better so you don't ever have to defrag, except maybe once a decade if that. NTFS cant do anything right and requires constant defragging, and with 1.5TB that takes too long ;-;