You are an expert at summarizing long articles. Proceed to summarize the following text: 
japan 's toshiba corp. announced wednesday plans to invest ### billion yen -lrb- one billion dollars -rrb- on a new clean room for the mass production of next-generation ##-megabit dynamic random memory -lrb- dram -rrb- chips .
toshiba announces one billion dollar investment on ##-megabit dram plant