MacBook Pro is not recognising my WD my passport external Hard drive

PLEASE PLEASE HELP
I have 200GB+ of data on my HDD and I DO NOT WAT TO FORMAT IT
I partitioned my WD my passport external Hard drive on Mac through Disk Utility
i then plugged it in to a windows XP computer
and when it did'nt recognise it i went to
right click My copmuter > Manage > Disk management > then i right clicked on the hard drive's name > convert to GPT disk
i though by doing that windows will recognise it .. it didnt
BUT .. when i reconnected it to my mac thats what i got
it still shows in my disk utility but all the options are greyed out
PLEASE if someone knows a way to fix this i'd really appreciate if you would tell me
i have really important documents on that hard drive
Thanks you in advance 

I have fears that you data may be gone.
Did you try to see if you could access data on the Windows PC?
I am not versed in Windows but based on the steps you describe suggests that you formatted the disk and erased it.  What you might try is to look for recovery software and see if there is anything to salvage.
Ciao.

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