Hey guys, yes you can 'stripe' 1 disk, kinda.
Hold on, before you flame, some of the Promise RAID controllers will allow you to run a single hard disk on the controller. If you plug a single drive in, and go to the Promise RAID BIOS to set it up, it will set the single drive as a "1+0 stripe array".
I KNOW this is technically incorrect/impossible, but the guys at Promise have set their BIOS up that way. Confusing, to say the least.
So, yeah, you can set up one drive, and BIOS will report it as a "1+0 stripe array", but thats not the correct wording.