31. Another non-volatile memory type is flash RAM, and like FeRAM it does not require a refresh process. 32. PSATs record data in non-volatile memory so that data are retained even if the power source fails. 33. However, most forms of non-volatile memory have limitations that make them unsuitable for use as primary storage. 34. They also use a non-volatile memory so that no information is lost if the batteries go flat. 35. HCI is the basis of operation for a number of non-volatile memory technologies such as EPROM cells. 36. The cartridge features a non-volatile memory ( NVR ) chip that stores lap times and game achievements. 37. Most modern semiconductor volatile memory is either static RAM ( SRAM ) or dynamic RAM ( DRAM ). 38. Forthcoming volatile memory technologies that aim at replacing or competing with SRAM and DRAM include Z-RAM and A-RAM. 39. Bubble memory is a non-volatile memory . 40. They typically store a full day's work in non-volatile memory of some type, such as an SD Card.