Plextor M5S, M5 Pro Get NAND Flash Design Change@ 2013/01/18
The TSOP chips feature maximum page-size of 16 KB/page, while the BGA chips feature 8 KB/page. In theory, this should improve "buffer management," when the controller decides to use NAND flash as scratchpads, in spite of having a gigabyte of DRAM cache at its disposal. Further, the new TSOP package NAND flash chips have lighter thermal requirements, letting Plextor get rid of the conductive thermal pads over the chips, saving a Dollar or two. The company did not release any markers on how to identify the two variants of drives by looking at serial numbers.