A:
"Mainstream " drives are equal to the previous label of "Blue"
and "Performance" equal to "Black" (Faster and uses more power than above)
for a gaming system you will want "Performance" drives if you want faster load times.
You will notice big differences in games like "World of Warships" the big difference whether you get into a match after it has already started or not.
if you want to make sure you load quick, a SSD will be a big jump over regular hard drives.
But stick with Western Digital if you go with a traditional Hard Drive, they are much better in performance than Seagate.. Trust me on that.