can I suggest that which I am trying on mine; shut down all unwanted/unneeded running programs; empty your temp internet folder, have no screan saver running;
when I first started, the drive was all over the place; ??how long is your basic defrag taking,and have you managed to run it through once yet??
( am continuing this "argument" ON forum deliberately so folks and anyone else with similar qibs can learn from the difficulties we both are evidently having, else i would suggest discussing it off forum...which we can do if you wish::)) )