In a particular implementation, at block 450, metadata associated with the information being written to {HEAD ~ NAND memory} may be written to PCM in {TAIL ~ a parallel process} 
In a particular implementation , at block 450 , metadata associated with the information being written to { HEAD ~ NAND memory } may be written to PCM in { TAIL ~ a parallel process }
OTH OTH OTH OTH OTH OTH OTH OTH OTH 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 TAIL