After installation of latest version of Defraggler 1.03.093, I found one bug that it randomly detects empty drive. I have card reader with 4 drives but it can only detect "E" and occasionally "F".
Furthermore, it seems not to support mobile hard disk. I have one 120GB HD connected but it can't show on Defraggler 1.03.093 but can on previous version Defraggler 1.02.085.