raid 0 has to be 2 or 4 etc drives to do it
raid 0 seek times go up (bad), raw mb/s goes up (good)
Nope, you simply need 2+ drives to do AID0. You can setup a 3, 5, or 7 disk AID0 array. Its a limit of the controller you use, not the RAID level. If you don't believe me, follow this link
and look at the pictures. They clearly show the performance difference between 2, 3, and 4 disk AID0 setups.