I am buying two identical harddrives, with a "raid" system. Whenever you load or do anything it does automatic mirroring, so one HD is a clone of the other.
The only thing I'm not sure of is if the error occurs during the write process and kills one drive ....does it kill the other...in which case you have a perfect f*ckup...lol
Don't buy/sell the stock because I did! Unless you want to lose money too!!