Time Machine erases G-Raid2 from desktop.

Hi, today i have connected by FW800 a new 1Tb G-Raid 2 disk (purchased on the Apple Store), to use it for my Time Machine copies, but as soon as i opened TM the disk disappeared from the desktop and even disk utility does not recognize it. I am now using a USB 2.0 connection, and it works, but i would like to use the FW800. Can you tell me if i have to do something special in order to get the FW800 mounted. thank you.

i tried reformatting and after not too long it started happening again but now its not just the time machine partition but both partitions that are randomly ejecting themselves from the desktop... i then get an error message that they werent put away properly and the only way to get them back is to unplug the power cord from the external hard drive and when i plug it back in they reappear...
is my drive on the way out or can i save it somehow??

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    i tried reformatting and after not too long it started happening again but now its not just the time machine partition but both partitions that are randomly ejecting themselves from the desktop... i then get an error message that they werent put away properly and the only way to get them back is to unplug the power cord from the external hard drive and when i plug it back in they reappear...
    is my drive on the way out or can i save it somehow??

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