Flash Memory

Overview

Flash memory allows data to be stored without requirements for power. These devices are called "flash" devices because data can be erased in a flash. Data stored in these devices can be erased and reprogrammed electronically. This technology has been incorporated in many electronic devices like calculators, digital cameras, LAN switches, and Personal Digital Applications.

There are three types of flash devices - flash memory drives, flash memory sticks, and flash memory cards. Flash memory cards are used in cell phones as Secure Digital (SD) cards and micro-SD cards, while flash memory sticks are used in digital cameras and camcorders. Flash drives are Universal Serial Bus (USB) devices that have a higher memory capacity. USB devices can be plugged into the USB socket of a computer. They are easily recognized by all operating systems. Flash memory is used for transporting data between physical locations that are not connected by a network. They can be considered as a replacement for CDs and DVDs, which were initially used to transport data.

Benefits

The major use of flash memory is data-transfer and transportation of data between physical locations. These drives are not affected by dust and scratches, which gives them an advantage over CDs and DVDs. They are highly rated because of their small size and high memory capacity. Another factor, which defines these drives, is the density of data or the data stored per square inch of memory. A large amount of data can be stored in a small space. There are no mechanical parts or fragile moving parts, which make them efficient data transport devices. These devices are known to work well even when subjected to heat and moisture. The power consumption of these devices is less when compared to other forms of drives.

How It Works

The basic principle of the working of a flash memory is based on electronics. Flash is like a special type of transistor. It has a source, drain, and two gates instead of one like a conventional transistor. Usually, when the power goes off, the transistor turns off and the data stored inside is erased. Here, the transistor retains electricity between the gates even when the power is off, thereby storing data. When the flash drive is connected to the computer through a USB port, the device is recognized and data can be accessed by means of a file explorer. Some of them might come with an "auto run" program with embedded software that allows you to access the files in the drive.