A year or so ago I had bought a Western Digital My Passport 1TB drive after checking TopTenReviews.com and some other places. I want to buy another one but now whenever I check Amazon or other online stores I only find My Passport Ultra and, recently, My Passport X. I have checked their reviews but they don't say what's the difference between the the different drives. So I wanna know what the difference is between the Basic, Ultra and X? Is Ultra better than the Basic one? And is X better than Ultra. Or is it just rebranding with the same performance? Also, which one is preferred for home use?