This document discusses different types of storage devices including optical storage devices. It provides a brief history of optical storage including the introduction of CDs in 1983, DVDs in 1996, and Blu-Ray in 2002. It describes how optical storage works by making marks on an optically readable medium that can be read back with a laser, and how data is stored in pits and lands. The document also outlines other storage devices like hard drives, solid state drives, flash memory, and magnetic storage devices.

1. Storage Devices

2. Introduction Of Optical Data Storage
 Optical storage is the storage of data on an optically readable
medium.
 Data is recorded by making marks in a pattern that can be
read back with the aid of light, usually a beam of laser light
precisely focused on a spinning optical disc
 An older example of optical storage that does not require the
use of computers, is microform.
 There are other means of optically storing data and new
methods are in development.

3. Optical Storage-History
In 1983  CD and CD-ROM.
In 1996  DVD-ROM and DVD-R.
In 2002  BLU-RAY.

4. TYPES OF STORAGE
Hard Disk Drive.
Solid State Storage.
Flash Memory.
Magnetic Storage.
Optical Storage Device like CD,DVD.

5. HARD DISK
A Hard Disk drive is a data storage device
used for storing and retrieving digital
Information using rapidly rotating disks.
An HDD consists of one or more rigid rapidly
rotating disks with magnetic heads arranged
on a moving actuator arm to read and write
data to the surfaces.

6. SOLID STATE DRIVE (SSD)
Data storage drive using Integrated circuit
assemblies as memory to storage
persistently.
SSD technology uses electronic interfaces
compatible with traditional block
input/output hard disk drives.

7. USB FLASH DRIVE
A USB flash refers to a type of computer
technology that stores data.
Flash memory is used in many different
appliances including memory card , PDAs.

8. COMPACT DISK
 Compact Disk(CD) is a circular disk of diameter of 120 millimeters(4.7 inch)

10. MAGNETIC STORAGE DEVICES
• How Magnetic Storage works
• Formatting
• Disk area
• Diskettes
• Hard disks
• Disk capacities
• Other Magnetic Storage Devices

16. Optical Storage Devices
• They store data on the refractive surface of
the disc so that it can be read by a beam of
laser light.
• A laser uses concentrated ,narrow beam of
light directed by lens ,prisms and mirror.
• The tight focus is possible because all the
light is in same wavelength

17. • To store data ,the disk’s metal surface is covered
with tiny dents (pits) and flat spots (lands)
,which cause light to be reflected differently.
• When an optical drive shines light into the pit
,the light cannot be reflected .this represent bit
value ‘0’. A land reflects light back to source
which represent bit value ’1’.
How Optical Storage Works

19. List of some Optical storage devices
 CD-ROM
 DVD-ROM
 CD-R
 CD-RW
 photo CD

20. Other Optical Storage Devices
 A CD-recordable drive lets to record your own
CD’s ,but data cannot be overwritten.
 A CD-rewritable lets to record your own CD’s
and can be overwritten.
 Photo CD technology is used to store digital
photographs.

21. THANK YOU….!!!
 17R21A0539 ----- TEJAS
 17R21A0540 ----- NANDHINI
 17R21A0541 ----- CHARITHA
 17R21A0542 ----- VEERESH