False! There are MANY people (me included) who run RAID 0 on OS/scratch disks. (And yes, you don't/shouldn't use RAID 0 on a server; but we aren't talking about servers here).You can ignore RAID 0 as that isn't even used now a days and doesn't even perform redundancy so it'll just confuse things.
Not exactly. RAID will NOT prevent data loss due to corruption,viruses,etc. The ONLY protection RAID (1,5,etc) provides is against HDD failure.In short the point of RAID is redundancy to prevent data loss. This is the fundamental idea of RAID.