In usb flash memory drives are very tiny, portable devices that have enormous storage capacity. It is an improved form of EEPROM which means Programmable Read Only Memory that is electro statically erasable. Using this technology the chips were written by passage of electrical circuit, but there will not be any loss of data if power failure occurs in between. Advantage of flash memory is that it be erased byte by byte, word by word or even a whole page or even a whole sector. Initially Flash memory was designed in such a way that, if anything has to be written in the flash area, the device will take the back up to its own (on flash buffer) ,erase everything in the flash and change the data which is to be updated in its own (on flash) and then write everything back to the flash. But now the technology has changed in such way that only the required portion is erased and the changes are made in the on flash and written back in to the original flash location. The advantage of this method is that is takes very less power.In usb flash memory devices are more resistant to damage, does not have any moving parts and even can be detached from the system before shutting down. Though it is highly durable, the durability of such devices depends on the number of write cycles.
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