A document describes the internal components of a USB flash drive and storage disk technologies. A typical USB flash drive contains a USB connector, storage controller, flash memory chip, crystal oscillator, LED indicator, and optional write-protect switch. It may also include space for a second flash memory chip. Common floppy disk sizes included 8-inch, 5.25-inch, and 3.5-inch disks. A CD contains a polycarbonate data layer with encoded bumps, a reflective layer, protective lacquer coating, and optional printed artwork, with data read by a laser beam being reflected back.

1. STORAGE DEVICES
By,
MARIE AMIRTHARAJ. F.

2. Internals of a typical USB flash drive
1 USB connector
2 USB mass storage controller device
3 Test points
4 Flash memory chip
5 Crystal oscillator
6 LED
7 Write-protect switch (Optional)
8 Space for second flash memory chip

6. 8-inch, 5¼-inch, and 3½-inch floppy disks

7. Diagram of CD layers.
A. A polycarbonate disc
layer has the data
encoded by using bumps.
B. A reflective layer reflects
the laser back.
C. A lacquer layer is used to
prevent oxidation
D. Artwork is screen printed
on the top of the disc.
E. A laser beam reads the
polycarbonate disc, is
reflected back, and read
by the player.