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