Mac cant see my WD MyBook studio HDD

[Fonzijr1964]

I have a 1Tb WD my-book studio that my mac will not recognize. It has worked for over 6 months but now it will not show up on the desktop

It seems to work via USB but not Fw800
any help?

 

[Fonzijr1964]

seems to work fine now just needed to be unplugged 4 times

 

[Fonzijr1964]

nope wont back up but it does see the HDD