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DATA STORAGE DEVICES
What Are Data Storage Devices

   All device Using for storing data. Recording
    can be done Mechanically, Magnetically, or
    Optically
HVD : Holographic Versatile Discs

   Hold 300 Gigabytes Of Data
   10 Times Faster Than A Normal DVD
   Little Wider Than Conventional DVDs
   And Also Slightly Thicker.
   Completely Based on concept of
    Holographic-memory
   Developed By InPhase Tech. & Optware
    Tech.
Basics Of Holographic Memory

   Phenomena of storing information in a
    light-sensitive crystal material using the
    interference of laser light.
   The recorded patterns of light are called a
    hologram.
   Hologram Is Creating By A Focused Beam
    – A Laser Light
   This Beam Is Split Into Two Parts
          1) Reference beam
          2) Information beam
Basics Of Holographic Memory

 Reference Beam Remains Unchanged
 Information Beam Passes Through An Image
 Then Carries That Image In Its Waveforms
 When Both Beams Intersect, It Creates Pattern Of
 Light Interference.
 Data Stored In Hologram
 Holograms Can Theoretically Store Equal To 1
 Bit/cubic block The Size Of The Wavelength
Holographic Versatile Discs

   This Is 40 year old concept. Initially Difficult To Make
   Because Systems Send Reference Beam & Info.
    Beam Into Recording Medium On Diff. axes
   HVDs Can More Than 1 Terabyte (TB).
   Accessed Entire Page At A Time Instead of
    Sequentially .
   HVD Stores Info. In Almost The Entire Volume Of
    The Disc.
   Stores 60,000 Bits Info. In One Pulse Of Light.
How Data Stores In HVDs
Structure Of HVDs
Structure Of HVDs In Thickness

                 1. Green writing/reading laser
                 (532 nm)
                 2. Red positioning/addressing
                 laser (650 nm)
                 3. Hologram (data)
                 4. Polycarbon layer
                 5. Photopolymeric layer (data-
                 containing layer)
                 6. Distance layers
                 7. Dichroic layer (reflecting green
                 light)
                 8. Aluminium reflective layer
                 (reflecting red light)
                 9. Transparent base
                 P. PIT
The HVD System

 A simplified HVD system consists of the
 following main components:
   Blue or green laser
   Beam splitter/merger
   Mirrors
   Spatial light modulator (SLM)
   CMOS sensor
   Photopolymer recording medium
HVDs Writing System
HVDs Reading System
HVDs Comparison

FACTORS                    Blu-ray          HD-DVD           HVD

Initial cost for           Approx. $18      Approx. $10      Approx. $100
recordable disc


Initial cost for           Approx. $2,000   Approx. $2,000   Approx. $3,000
recorder/player


Initial storage capacity   54 GB            30 GB            200 GB


Read/write speed           36.5 Mbps        36.5 Mbps        1 Gbps
HVDs Comparison
Storage Medium   Access Time   Data Transfer Rate   Storage
                                                    Capacity


Holographic      2.4 µs        10 GB/s              400Mbits/cm sq.
Memory


Main Memory      10 – 40 ns    5 MB/s               4.0 Mbits/cm sq.
(RAM)

Magnetic Disk    8.3 ms        5 – 20 MB/s          100 Mbits/cm sq.
Summary Slide

 Different Type Of Data Storage Devices Are:-
   Mechanical
            Punch card, Paper Tape
   Magnetically
            Recording Tape, Gramophone
   Optical
            CDs, DVDs, HD-DVDs
   Coming Day Technology
            Blu-Ray Disk (BDs)
   Future World Devices
            Holographic Versatile Discs
For Listening Us
Carefully

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Data Storage Devices Holography

  • 2. What Are Data Storage Devices  All device Using for storing data. Recording can be done Mechanically, Magnetically, or Optically
  • 3. HVD : Holographic Versatile Discs  Hold 300 Gigabytes Of Data  10 Times Faster Than A Normal DVD  Little Wider Than Conventional DVDs  And Also Slightly Thicker.  Completely Based on concept of Holographic-memory  Developed By InPhase Tech. & Optware Tech.
  • 4. Basics Of Holographic Memory  Phenomena of storing information in a light-sensitive crystal material using the interference of laser light.  The recorded patterns of light are called a hologram.  Hologram Is Creating By A Focused Beam – A Laser Light  This Beam Is Split Into Two Parts  1) Reference beam  2) Information beam
  • 5. Basics Of Holographic Memory Reference Beam Remains Unchanged Information Beam Passes Through An Image Then Carries That Image In Its Waveforms When Both Beams Intersect, It Creates Pattern Of Light Interference. Data Stored In Hologram Holograms Can Theoretically Store Equal To 1 Bit/cubic block The Size Of The Wavelength
  • 6. Holographic Versatile Discs  This Is 40 year old concept. Initially Difficult To Make  Because Systems Send Reference Beam & Info. Beam Into Recording Medium On Diff. axes  HVDs Can More Than 1 Terabyte (TB).  Accessed Entire Page At A Time Instead of Sequentially .  HVD Stores Info. In Almost The Entire Volume Of The Disc.  Stores 60,000 Bits Info. In One Pulse Of Light.
  • 7. How Data Stores In HVDs
  • 9. Structure Of HVDs In Thickness 1. Green writing/reading laser (532 nm) 2. Red positioning/addressing laser (650 nm) 3. Hologram (data) 4. Polycarbon layer 5. Photopolymeric layer (data- containing layer) 6. Distance layers 7. Dichroic layer (reflecting green light) 8. Aluminium reflective layer (reflecting red light) 9. Transparent base P. PIT
  • 10. The HVD System A simplified HVD system consists of the following main components: Blue or green laser Beam splitter/merger Mirrors Spatial light modulator (SLM) CMOS sensor Photopolymer recording medium
  • 13. HVDs Comparison FACTORS Blu-ray HD-DVD HVD Initial cost for Approx. $18 Approx. $10 Approx. $100 recordable disc Initial cost for Approx. $2,000 Approx. $2,000 Approx. $3,000 recorder/player Initial storage capacity 54 GB 30 GB 200 GB Read/write speed 36.5 Mbps 36.5 Mbps 1 Gbps
  • 14. HVDs Comparison Storage Medium Access Time Data Transfer Rate Storage Capacity Holographic 2.4 µs 10 GB/s 400Mbits/cm sq. Memory Main Memory 10 – 40 ns 5 MB/s 4.0 Mbits/cm sq. (RAM) Magnetic Disk 8.3 ms 5 – 20 MB/s 100 Mbits/cm sq.
  • 15. Summary Slide Different Type Of Data Storage Devices Are:- Mechanical  Punch card, Paper Tape Magnetically  Recording Tape, Gramophone Optical  CDs, DVDs, HD-DVDs Coming Day Technology  Blu-Ray Disk (BDs) Future World Devices  Holographic Versatile Discs