<P> Another example is the Toshiba PX02SS enterprise SSD series, announced in 2016, which is optimized for use in server and storage platforms requiring high endurance from write - intensive applications such as write caching, I / O acceleration and online transaction processing (OLTP). The PX02SS series uses 12 Gbit / s SAS interface, featuring MLC NAND flash memory and achieving random write speeds of up to 42,000 IOPS, random read speeds of up to 130,000 IOPS, and endurance rating of 30 drive writes per day (DWPD). </P> <P> The key components of an SSD are the controller and the memory to store the data . The primary memory component in an SSD was traditionally DRAM volatile memory, but since 2009 it is more commonly NAND flash non-volatile memory . </P> <P> Every SSD includes a controller that incorporates the electronics that bridge the NAND memory components to the host computer . The controller is an embedded processor that executes firmware - level code and is one of the most important factors of SSD performance . Some of the functions performed by the controller include: </P> <Ul> <Li> Bad block mapping </Li> <Li> Read and write caching </Li> <Li> Encryption </Li> <Li> Error detection and correction via Error - correcting code (ECC) </Li> <Li> Garbage collection </Li> <Li> Read scrubbing and read disturb management </Li> <Li> Wear leveling </Li> </Ul>

Solid state hard drive vs mechanical hard drive