1. Does the fact that most XHD's now have a 2.0 USB make it not compatible with older computers.... or should that not matter?
It doesn't matter if it is USB 2.0 in a 2.0 or 1.1 slot, it will just not run as fast in a lower-versioned port. In fact, in Windows XP, if you plug in a USB 2.0 device to a 1.1 port it will say "This device can run faster."
2. Is a 1TB XHD too big to hook up to these types of computers?
If the hardware is newer (i.e. about 1999 and newer) then this shouldn't be an issue, because BIOS's and Windows 2000/XP support around 7TB of storage. This limitation should apply similarly to Mac OSX as well.
3. Did I just get a crappy XHD and that happens sometimes....go get another one?
You may have gotten a faulty enclosure with your hard drive. If it is still in warranty, you may be able to get another. If not, perhaps try a hard drive test with the drive in another enclosure.
4. WD vs. Seagate....these are said to be the best....any suggestions?
Western Digital and Seagate are certainly at the top of the game as far as names go. I wouldn't call one better than the other in this situation, it is pretty much even. In my experience, Hitachi drives can be iffy. Everything else is pretty much standard.
5. I got the 1TB because it was cheap and had a ton of space. If I start with a smaller 500 or 750, will those be less stressful on my systems and more easily recognizable?
Well, smaller drives will seek faster. But it really doesn't matter too much anymore.
Edited by E-werd, 25 January 2009 - 10:08 PM.