that makes sense

do i still have to format the second hard drive? do i do that in "disk management" under control panel? as a primary or extended?
after installing windows numerous times i gave up and installed to a single 500gb hard drive. if i do it again im going with a raid 0. im not sure if its even worth it for me. does read/write time actually improve that much? i was under the impression it would give me better disk performance overall. am i mistaken? is raid more of an office type setup or will it help all around(desktop,games,virus scans,update downloads,opening apps etc) ?
setting up a raid was the whole reason i bought a second 500gb hard drive