SMALL PPT.ON PEN DRIVES.....HOPE U LIKE IT

1. Universal Serial Bus (USB)

2. A pen drive is a portable Universal Serial Bus (USB)
flash memory device for storing and transferring
audio, video, and data files from a computer.
USB flash drives are typically removable and
rewritable, and physically much smaller than
an optical disc.

3. • BEFORE PENDRIVE……...
FLOPPY DISC / DISKETTE,
1.44 megabytes

4. • COMPACT DISC
LIMITED STORING CAPACITY
SIZE
Optical discs require special drives to read/write.

5. Pua Khein Seng
First PEN DRIVE appeared in market in 1995 & 1998
with maximum transfer rate of 12mbps
High speed PEN DRIVES released in market in 2000
with speed of 480 mbps

6. Components involved
Standard-A USB plug.
controller chip is the ‘brain’ of the flash drive
NAND flash memory chip(s)
Crystal oscillator It is used as a digital “clock”.

7. Crystal Oscillator: It is used as a digital “clock”.
6)LED indicator light
3) The controller chip is the ‘brain’ of the flash drive.
2 ) NAND Flash memory storage chip is the
place where all our files are stored.

8. Working mechanism:
• Pen Drives have a storage capacity up to 256 GB.
The internal circuitry of the pen drive draws
power from the computer for its operation
• There are two chips, one is the USB controller
and the other is the flash memory chip.
• The IC SK6211 is a controller which facilitates the
data communication between the PC/Laptop and
the flash memory (EEPROM) of the pen drive

9. • The second chip is a NAND type flash memory
which has fast read, write and erase cycles.
• The crystal oscillator used here runs at a clock
frequency at 12 MHz

10. LATEST PENDRIVES

11. USES AND FEATURES………
MAJOR CONTRIBUTION IN MEMORY STORAGE…
EASY TO CARRY, PORTABLE ,FEASIBLE & DURABLE
RESISTANCE TO SCRATCHES AND DUST
Can store more data and transfer faster than much
larger optical disc drives like CD-RW or DVD-RW drives
Pen drives are supported by operating systems such
as Linux, OS X, Windows, Unix-like systems and read by
many other systems such as the Xbox 360, PlayStation 3,

12. DISADVANTAGES
• SIZE : Being small leaves some devices to be
easily misplaced
• IT BREAKS IT GONE : Compared to some CDs
that can be repaired once scratched to
retrieve data , USBs once they fail they fail .

13. .