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