did a wiki on it, came up with nothing
did a google and came up with this
the linear/non-linear refers to addressing
linear memory is NOR flash
& non-linear memory is NAND flash
i came across this article which states that NOR flash data and command bus are seperate and on the NAND flash they are multiplexed. how does that make addressing scheme non-linear though?
linear and non-linear flash 
Linear Mode
