The 64GB M225 2.5" Solid-State Drive from Crucial is a 2.5" SSD storage drive. Perfect for use in notebook systems, which generally feature 2.5" hard disk bays, the drive delivers superior performance and reliability when compared to traditional magnetic hard disk drives. It can write data at speeds of up to 150MB/sec and read data at 200MB/sec. Because it uses NAND flash memory and features no moving parts, you don't have to worry about it crashing.