Hi ! i have a big problem.I have my book pro edition 2 but it does not work.My raid0 status is bad. how can ı solve this problem .Please help me 
AFAICS, you will need to remove each drive and test it separately by connecting it to your computer. Don’t allow your OS to write anything to the drives. Your next step will depend on what you find.
How to dismantle a WD My Book Pro II, WD My Book Premium II, or WD My Book World II drive to replace a hard drive:
http://wdc.custhelp.com/cgi-bin/wdc.cfg/php/enduser/std_adp.php?p_faqid=1464
