External HDD not recognized by any computer

Hello, i know this is quite common topic, but i need help urgent!!!
I have an ADATA external HDD 640 GB. Running Win7. It was working fine until Saturday, it just stopped working. If i unplug and plug it back it says " New device was found, want to format?" Click Cancel says "Unknown file formats were found cannot access the device".

Tried this:
1. change the name of partition, nothing happened
2. I moved it on other devices no other computer sees it
3. Tried SpinRite V6 for 2 nights, nothing happened, Recuva also, says: "Could not find bootable info"

What it does:
1. If i open MyComputer it is there, named "P" now, click explore, nothing happens
2. In Desk management it is File System RAW, if i click Properties for this HDD it says that everything is right except: in General, it does not recognize anything, says 0GB available, 0GB used, i could even access the part where it has "Update driver" and Driver Details....everywhere it says that it is working fine!

This was the Backup HDD for my laptop, because all the information from my internal HDD were damaged because of a virus.

Please tell me what is left to do?!?! I really need help!!!
Thank you so much!!!
Annya
 
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