Make sure you move the files ‘together’ ie into the same folder structure onto your new drive. When you open your project, AE will complain about missing files.
Select one of the missing files in the project window and do a ‘Replace footage file’ – once AE finds it, it is smart enough to find all the others that are missing if they are in the same place relative to the first file.
I have done this often for footage on drives that go offline, and for moving from computer to computer, even Mac to PC and back – pretty safe to do.
Enzo Tedeschi
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Editor
Sydney, Australia