Small capacity HDDs in RAID??

Yeah, I've noticed a lot of systems which run RAID, (mirrored or Striped) tend to use 80gb or less and use large external capacity HDDs for documents etc. I assume that if its mirrored then its quicker access to data and striped is basically data back up of main drive? Is that RAID 0 and 1 respectivley? Or is the other way round?
 
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