As one kind of semiconductor memory, flash memory is nonvolatile; that is, written data does not disappear when the power is switched off. Although it has the merits that data can be read and written at high speed and written and erased freely, the number of times data can be written and the time span over which data can be stored are limited.
As for products in which flash memory is applied, SD memory cards (which are utilized as the memory medium in electronic devices like digital cameras and mobile music players), solid-state devices (SSDs), and USB memories are typical examples.
