The sandisk extreme 900 portable ssd is a reliable ssd solid state drive that can deliver up to 9x the speed of a regular portable hard drive it is built to resist shock vibrations and temperature extremes and uses 128 bit encryption to keep your files safe its silent due to the lack of moving parts and does not generate heat when in use transfer big videos and photo libraries with speeds of up to 850mbsec using super fast usb 31 to connect to your computer or laptop