How Flash Memory Works ?
Flash drive technology has taken computer use to another level in recent years. Wikipedia describes flash memory as “a non-volatile computer storage that can be electrically erased and reprogrammed.” The primary use for flash memory is in external cards and flash drives that can be inserted in the Universal Serial Bus (USB) port on a computer.
This method allows for storage and retrieval of data, apart from the internal hard drive. Information that is stored on a flash drive can be taken to another computer or other digital-electronic equipment. The flash drive or memory card is simply removed from the USB port and carried to a second workstation or computer.
That is the most fundamental description of how flash memory works. But the details will tell us even more. The method of storage and retrieval in flash drives and memory cards is based on Electrically Erasable Programmable Read-Only Memory (EEPROM). The key to efficiency with flash memory is that the information can be stored and erased in fairly large sections but it isn’t necessary to erase an entire storage chip completely. EEPROM that was programmable and erasable at the byte level was more expensive and less efficient than current flash memory.
The ability to store, manage and retrieve blocks of information almost at will has contributed to the massive growth in the use of personal digital assistants (PDA), music players based on digital technology, mobile phones and similar equipment. Game technology is highly dependent on flash memory, allowing players to save individual games and playing sessions.
A key element of this technology is this: information can be saved on a flash memory unit and maintained without a power source. In addition, users can access the information quickly, though access is a bit slower than the main memory systems of a desktop or laptop computer. Current flash drives and memory cards are very durable because of their design. There are no moving parts, as there are with internal and external hard drives, and they are highly resistant to temperature changes and physical vibration.
Flash memory was first developed in about 1980. The quick process of erasing information in larger sections led to the name “flash” being applied to the technology. Flash chips are an advance over Read-Only Memory (ROM) that is basically used for information and programs that don’t need regular updates and changes.
The newest generation of flash memory has greatly extended storage capacity while maintaining fast write and retrieve times. At the material level, flash memory uses individual cells that work with gate transistors. As described in Wikipedia, multi-cell cell devices “can store more than one bit per cell by choosing between multiple levels of electrical charge to apply to the floating gates of its cells.” One of the best descriptions for how a flash memory device works at the basic level indicates that the floating-gate transistor is “electrically isolated by its insulating layer, any electrons placed on it are trapped there, and under normal conditions, will not discharge for many years.”
Category: Technology