Western digital external problems with my macbook pro

So i have had this WD external hard drive for maybe 2 years now, and its been working fine, but as soon as i plugged it into a PC it didnt work, which i though was weird, but as soon as i plugged it back into my mac, my mac kept saying that it cant recognize the disk, i didnt do anythign besides plug it into a windows and now it wont work, can anyone help?

WD drives tend to be junk so I am not particularly surprised. If it has both USB and FireWire have you tried it on the other bus? If you plug it in and look at the System Profiler does it at least see the drive?

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