As a result, at block 420, {HEAD ~ the FTL} may determine a free portion of {TAIL ~ NAND memory} in which to write information of the write request 
As a result , at block 420 , { HEAD ~ the FTL } may determine a free portion of { TAIL ~ NAND memory } in which to write information of the write request
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH