Mehrotra said the additional rate for PC flash drives in 2017 is about 35 percent, and will increase to 75 percent by 2020. And "a lot of hard drives still need to be replaced by SSDS... Future self-driving vehicles are expected to be equipped with about 40GB of DRAM... This will also drive the use of NAND flash memory." Torque is the force that causes the object to rotate. Engine torque refers to the moment when the engine outputs from the crankshaft. It is inversely proportional to the engine speed under the condition of fixed power, and the faster the torque is smaller, the larger it is, which reflects the load capacity of the car in a certain range.