Hi, I have a ibook G4 1.2ghz. I don't have that much space in my hard drive. I want to buy an external hard drive. Questions - 1. Firewire External Hard drives are expensive. Is there any big difference between USB & Firewire? 2. I want to buy a 160gb hard drive & a Hard drive enclosure. Should I go for it or it will be better to buy a External hard drive? 3. Can I install App in the External Hard drive to save space? 4. Can I reformat that hard drive in windows and use it with my Mac? I want to use this hard drive winth Windows & Mac. 5. Which External hard Drive do you like? ( Under $150 ) Please help me. Thanks in Advance.