RAID0

RAID0 is striping across multiple physical disks without any parity - this means that, while you are gaining something in terms of read and write speed, and your total volume space is the sum of the space on your individual providers (drives), any single point failure will irretrievably destroy ALL data in that array.

FreeBSD does support geom RAID0 striping, should you wish to indulge yourself in it, but unless you're setting up a more complex multi-stage array - for example, a RAID0 striping of RAID1 mirrored providers - it is HIGHLY RECOMMENDED that you do not use this RAID type.