In these days when computers are utilised in all the small scale as well as large scale companies for automation of all the process and also to save and store the important data, power failure is a major constraint that everyone faces as there are chances to lose vital information due to this problem. But the technological advancements have progressed to cope up with this problem, by the invention of flash memory. It is so designed that it rules out the need of power supply for the storage of data. This property of flash memory is utilised to structure usb flash memory, which are low weight, highly compact storage disks that can be used for transferring data from one computer to another. Flash memory is used due to the fact that when these chips are packed together to form a memory card, it is found that it is resistant to severe stress, changes in pressure and temperature which in turn increases the life span. Hence usb flash memory devices are more durable and withstand damage than the earlier storage devices, which were more sensitive to pressure. Thus these are considered as the perfect devices for storage and transfer of vital data.