One is a WD Black and the other is a Seagate. Had a WD My passport crap out on my while on deployment. I always install them and format them in Windows, if needed. Don't remember if I used MBR or GPT on these...
4500RPM? damn, that's slower than a laptop. How can you stand it? Or, do you mean 5400?
Just broke my personal record for number of consecutive days without dying!