I have recently made the plunge into mac kingdom and very pleased so far. I am going through the pain staking task of transferring music, photos etc.. from my windows laptop to my new macbook pro. I started off by setting up file sharing and copying files but it is taking absolutely ages. Ideally I would like to use my 500gb mybook external hard drive but given an experience I just had when putting a memory stick in my mac straight after loading it up from my pc am I likely to lose all my current external hard drive data? Complete ball ache if thats the case as all my films are on there and burning it all to DVD would take forever.