Saturday, December 24, 2011

Pen Drives that keeps your information safely

A USB flash drive is a data storage device that consists of flash memory with an integrated Universal Serial Bus (USB) interface.USB flash drives are usually removable and rewritable, and physically much smaller than a floppy disk. Most weigh less than 30g.As of September 2011 drives of 256 gigabytes (GB) are obtainable,and storage capacities as large as 2 terabytes (TB) are planned, with steady improvements in size and cost per capacity expected. Some permit up to 100,000 write/erase cycles (depending on the exact type of memory chip used) and 10 years shelf storage time. USB flash drives are often used for the same purposes for which floppy disks or CD-ROMs were used.
They are smaller, faster, have thousands of times more capacity, and are more long lasting and reliable because they have no moving parts. Until about 2005, most desktop and laptop computer computers were supplied with floppy disk drives, but floppy disk drives have been abandoned in favor of USB ports. USB Flash drives use the USB mass storage standard, supported natively by modern operating systems such as Linux, Mac OS X, Windows, and other Unix-like systems. USB drives with USB two.0 support can store more information and transfer faster than much larger optical disc drives like CD-RW or DVD-RW drives and can be read by lots of other systems such as the Xbox 360, PlayStation three, DVD players and in some upcoming mobile smartphones. Nothing moves mechanically in a flash drive; the term drive persists because computers read and write flash-drive information using the same technique commands as for a mechanical disk drive, with the storage appearing to the computer operating system and user interface as another drive. Flash drives are very robust mechanically. A flash drive consists of a small printed circuit board carrying the circuit elements and a USB connector, insulated electrically and protected inside a plastic, metal, or rubberized case which can be carried in a pocket or on a key chain, for example. The USB connector may be protected by a removable cap or by retracting in to the body of the drive, although it is not likely to be damaged if unprotected. Most flash drives use a standard.

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