I got 3 WD elements i'm wiping to re-use again...... however two of these always turn out ok.... But i keeping going though the 3rd drive needing to replace it time and time again... I'm either thinking of 1. Switch to another manufacture or 2. Work out why only 1 of the 3 of drives keeps reporting I/O errors and the failing After hooking the troubled drive to Mac mini, terminal reported i/o errors when trying to erase. However attaching it to the Macbook reveals no problem.... however after the first successful wipe,, its suddenly slowing down.... So why wouldn't the Macbook pro report I/O error while Mac Mini did ? Any Ideas?