NOR Vs NAND

NOR
Access - linear random
Replace - ROM
Cost - expensive
Density - low
Earse time - 1 second
Programing - byte by byte
OOB data - no
NAND
Access - pagewise
Replace - mass strorage
Cost - cheap
Density - high
Earse time - 2 ms
Programming - pagewise, must be erased before
OOB - yes