{HEAD ~ Method} for organizing storage devices of unequal storage capacity and distributing {TAIL ~ data} using different raid formats depending on size of rectangles containing sets of the storage devices 
for distributing
{ HEAD ~ Method } for organizing storage devices of unequal storage capacity and distributing { TAIL ~ data } using different raid formats depending on size of rectangles containing sets of the storage devices
HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH