I don't know what you're using to move the files, but a move usually involves deleting the file off the source, whereas copy leaves the original in place. I'm guessing the error you're getting is because the file can't be deleted from a read only ADF file so you could try changing the ADF to allow it to be editable.
To change the ADF to read/write single click the adf icon and right click to bring up the menu and look at the information for the adf. There is a tooltype 'writeprotected=no' but it's commented out with brackets by default. Remove the brackets and save and the disk should become read/write when mounted.
