bios blu-ray disc booting bubble memory ddr sdram delay line memory digital camera drum memory dynamic random access memory eeprom eprom ferroelectric ram flash memory floppy disk integrated circuit magnetic core memory magnetic tape magnetoresistive random access memory mask rom modem nano-ram optical disc organic electronics phase-change memory plated wire memory printed electronics programmable metallization cell programmable read-only memory quartz racetrack memory resistive random-access memory sonos static random access memory transistor twin transistor ram twistor memory ultraviolet volatile memory wavelength williams tube z-ram