First, thanks for your help

My drive is an USB drive, model SilverStone SST-TS05B.
Why I look up the model in the system profiler I find the result shown on my screenshot. But I don't understand, because it works fine in my Parallel VM under Seven : the problem appears only on the MAC OS X....?! And before the 1.6.3, it works fine on MAC OS X (except with Avatar Bluray).

Best regards
Vincent