Pen drive


Published on

The presentation gives information about origin of pen-drive,description,features, mechanism, available brands.
Feel free to share & comment !!!!

Published in: Technology
1 Comment
No Downloads
Total views
On SlideShare
From Embeds
Number of Embeds
Embeds 0
No embeds

No notes for slide

Pen drive

  1. 1. PEN DRIVE
  2. 2. Definition of a pen drive • A USB flash drive is a data storage device that includes flash memory with an integrated Universal Serial Bus (USB) interface. USB flash drives are typically removable and rewritable, and physically much smaller than an optical disc.
  3. 3. Description : • A pen drive, or a USB flash drive, is a portable data-storage device. • Most weigh less than 30 grams • Storage capacities as large as 2 TB are planned, with steady improvements in size and price per capacity expected. • USB flash drives are often used for the same purposes for which floppy disks or CDs were used, i.e., for storage, back- up and transfer of computer files. • USB flash drives use the USB mass storage standard, supported natively by modern operating systems such as Linux, OS X, Windows, and other Unix-like systems, as well as many BIOS boot ROMs. USB drives with USB 2.0 support can store more data and transfer faster than much larger optical disc drives like CD-RW or DVD-RW drives and can be read by many other systems such as the Xbox 360, PlayStation 3,
  4. 4. Components involved: • 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. • There are typically four parts to a flash drive: • Standard-A USB plug. • USB mass storage controller • NAND flash memory chip(s) • Crystal oscillator • Cover - typically made of plastic or metal - to protect the electronics against mechanical stress and even possible short circuits
  5. 5. Additional components • The typical device may also include: • Jumpers and test pins – for testing during the flash drive's manufacturing or loading code into the microprocessor. • LEDs – indicate data transfers or data reads and writes. • Write-protect switches – Enable or disable writing of data into memory. • Unpopulated space – provides space to include a second memory chip. • USB connector cover or cap – reduces the risk of damage and prevents the entry of dirt. • Transport aid – the cap or the body often contains a hole suitable for connection to a key chain or lanyard. • Some drives offer expandable storage via an internal memory card slot, much like a memory card reader.
  6. 6. Working mechanism: • USB Flash Drives or commonly called as Pen Drives are popular removable storage media having a storage capacity up to 256 GB. • The internal circuitry of the pen drive draws power from the computer for its operation. They have an integrated USB interface to communicate with the computer. The important parts of the pen drive are USB connector, crystal oscillator, memory chips and a controller to interact with the PC. The pen drive used here has storage capacity of 4GB.
  7. 7. • The USB connector is protected by either retracting into the body or by covering by a removable lid. There are two chips, one is the USB controller and the other is the flash memory chip. • The IC SK6211 shown in the above image is a controller which facilitates the data communication between the PC/Laptop and the flash memory (EEPROM) of the pen drive.
  8. 8. • The second chip which is shown in the image above is a NAND type flash memory which has fast read, write and erase cycles.
  9. 9. • This image shows the other side of PCB. The second memory chip, a crystal oscillator and a number of surface mount components are soldered which are required for the operation of the pen drive. • The crystal oscillator produces the clock signal for the correct operation of the device. The crystal oscillator used here runs at a clock frequency at 12 MHz.
  10. 10. Available brands • Kingston: Kingston's DataTraveler USB Flash Drive is the latest in portable flash memory storage from the greatest name in memory. Reliable and easy to use. • Transcend:JetFlash are a series of flash based USB drives designed and manufactured by Transcend, a multi- national Taiwanese company.
  11. 11. • Sandisk: Sandisk’s flask memory technologies are used by many of the world's largest data centers, embedded in the most advanced smartphones, tablets, and laptops, and are trusted by consumers around the world. • HP: HP offers a broad range of flash drive to enhance storage capabilities for your business and home PCs. • Iball: iball offers a wide range of portable devices with it’s most recent and innovative new product, called the hybrid dual connector pen drive. The dual connector flash drive comes with standard USB 2.0 on one side and a microUSB connector on the other.. • Other available brands are samsung,lg,song etc etc