Originally Posted by Dreaming 
Just tried active SMART which is supposed to the be the dogs, but that two just read the drives as japanese symbols
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Don't bother with any third party tools, there's more chance for them to confuse the issue than there is for them to help. The WD diagnostic is quite comprehensive and, alongside the Matrix Storage Manager inside the OS, will tell you everything you need to know.
It could well be that the SMART event is not a critical one, in which case there's no desperate need to worry. However, it is equally possible that the drive is defective. You need the WD tool to tell you that, and the way to get it working is to temporarily disable RAID.