We released a new build of R-Studio: When enumerating files on a FAT partition, it throws a warning that some files cannot be correctly located due to corruptions in file systems made by Windows when it deletes a large number of files. In this case R-Studio throws a warning asking the user to scan the disk to located those files correctly.
http://forum.r-tt.com/r-studio-7-7-159213-7-7-159222-t8923.html