28-12-2010, 04:56 PM
Prepared By,
Harshil Dave
Harshil Dave
Final Holographic Data Storage System.pptx (Size: 1.44 MB / Downloads: 185)
INTRODUCTION
>>Devices that use light to store and read data has always become the backbone of our data storage system for nearly two decades. Each time you access towards the large repository of digital information.
>> All the way to the mammoth 320 GB hard disk drives available today, we use also optical devices such as CDs ,DVDs and Blue-Ray Disk .
>> With the promise of tomorrow's operating systems and create new era of storage via laser, the demands of being able to quickly store and retrieve enormous quantities of data are ever increasing.
DEFINITION
>>Holographic memory is a technology that can store information at high density inside crystals or photopolymers.
>>Conventional memories use only the surface to store the data. But holographic data storage systems use the volume to store data.
BASIC PRINCIPLE OF HDSS
>>A hologram is a block or sheet of photosensitive material which records the diffraction of two light sources.
>>To create a hologram, laser light is first split into two beams:
1.Source beam- Data signal
2.Reference beam- Carrier signal
>>And both intersect on hologram.
>> While reading data we hit Reference signal on exact angle which was use during writing process.