Types of memory that retain their contents when power is turned off. ROMs, PROMs, EPROMs and flash memory are examples. Sometimes the term refers to memory that is inherently volatile, but maintains its content because it is connected to a battery at all times, such as CMOS memory and to storage systems, such as hard disks.
Memory whose contents are preserved when the power source for a device is off. Expansion cards, the ROM (read-only memory) chip in a Palm device and the internal flash memory or hard drive found in select models are examples of persistent, non-volatile memory.
Semiconductor memory which will not forget its data once the power is switched off. This is in contrast to volatile memory (e.g. DRAMs), which lose their information when there is no power supplied to the chip.
Non-volatile memory, or non-volatile storage, is computer memory that can retain the stored information even when not powered. Examples of non-volatile memory include read-only memory, flash memory, most types of magnetic computer storage devices (e.g. hard disks, floppy disk drives, and magnetic tape), optical disc drives, and early computer storage methods such as paper tape and punch cards.