My passport studio is not recognised

A colleague of mine gave me an unused WD my passport Studio 320 GB, but when i inserted it in my macbook pro, it was not recognised.
After a while I disconnected the WD and almost immediately a message showed up on my screen, saying that the diski is not proper for use or something like this.... and it gave me 3 options: initialize, ignore or eject.
I chose ''initialize'' and disk utility was opened and the disk was recognised! but I didn't have any choice of verification or repair etc.
The only thing I could do was to erase the disk! I didn't do anything because I wanted to know more.... Could you help me?

Try  >  http://support.apple.com/kb/TS1538

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