Write caching is a cool feature that alllows your data to be written to a temporary space instead of have to write it to your hard drive constantly. Its save in that space to a later point to be written. This takes the load off your hard drive and CPU because normally the hard drives and CPU have to constantly communicate when write data to the hard drive. So enable this function to get a performance boost. For more help on improving your hard drive speed. Check out: bit.ly