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