I am going to buy an internal HD to be put into an external case for my backing up of my laptop (XP SP2). Here are my questions:

1. What is the difference between IDE and SATA?
2. Would you rather buy an IDE or SATA HD?
3. I am going to use it for backing up my laptop. Will use both firewire and USB 2.0. Will either IDE or SATA work without having to reconfigure anything?
4. Should external cases have fans? (I only plan on backing up once every 2-4 weeks)
5. What is your opinion on http://www.newegg.com/Product/Produc...82E16817145657
6. If you don't like the product above, what external case would you recommend? (Price range ~ $50)

Thank you very much!