the drawback with RAID 0 is if 1 drive goes down, you loose the data on the second drive.
the data is written in "stripes" across both drives simultaneously, faster than writing the same data to 1 drive...the same data is not written on both dives.
RAID 3/5 offers the writing speed of RAID 0 with a "parity" drive in case 1 drive fails - hopefully not the parity drive!