Flask Disk

USB flash drive (USB flash drives are often also called flash or UFD) is a data storage device type NAND flash memory with integrated USB interface. Flash drives are typically small, lightweight, and can be easily readable and writable. As of November 2006, the available capacity for a USB flash drive there from 64 megabytes up to 512 gigabytes. The amount of media capacity depends on the technology used in flash memory.
USB flash drives have many advantages compared to other data storage devices, particularly floppy disks or compact discs. This tool is faster, smaller, with greater capacity and more reliable (because it has no moving parts) than floppy disks.
But the flash data storage also has a short life, usually resistance data on the flash five-year average. This is due to the flash memory used did not last long. Compare with hard drives that have a resistance data up to 12 years, CD / DVD quality (and famous branded) for 15 years if the correct way of storage.

USB Flash Drive in Windows
Microsoft Windows operating system implements a USB flash drive as a USB Mass Storage Device, and use the device drivers usbstor.sys. Because it features Windows has an auto-mounting, and USB flash drive is a plug and play device, Windows will try to run it as much as possible the moment the device is plugged into a USB socket. Windows XP and later even the Autoplay feature, which allows the flash drive is accessed as a whole to determine what the contents of a USB flash drive.
But flash is a soft medium for spreading viruses, because the virus' ability to copy itself to the flash and run automatically when plugged in USB port (which the Autoplay function on Windows systems are not turned off). Many local computer viruses such as Brontok / RontokBro, PendekarBlank, and other local viruses using a USB flash drive as media of virus transmission from one host to another host, replacing the floppy disk. Viruses most of which run on top of Windows will be faster when it was circulated teserbut Windows accessing the drive using the autoplay feature to Windows. Consequently, there is a good idea to disable the autoplay feature, although this is less so help prevent the spread of the virus.

source: http://id.wikipedia.org/wiki/USB_flash_drive