MIS205'1 Group

1
MIS205.1 Group 9 Presentation

• Presentation Topic
• New Trends In Computer Storage Technology
• Presenters
• M. Ashique Elahi Mojumder
• M. Mahfuz Hossain
• A. S. M. Abdun Noor

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New Trends in Storage Technology

• What Is Storage Technology?
• Why should it be digital?
• Where did the trend start?
• Where is it now?

3
New Trends in Storage Technology

• The Technologies
• Magnetic Tape
• Example Audio and Video Cassettes
• Magnetic Disc
• Example Floppy Disk, Hard Disc
• Optical Disc
• Example CD, DVD
• Magneto Optical Disc
• Example Zip-drive, Jazz-drive Ditto-drives

4
Magnetic Tape Technology

• Paper Coated Magnetic Tape
• Limitations
• Tore too easily
• No Random Access
• Single head
• Plastic Coated Magnetic Tape
• Limitations
• No Random Access
• Single head

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Magnetic Disk Technology

• Device Heads can move randomly
• Circular Magnetic Tapes
• Open Chain Technology (Jumping Head)
• Close Chain Technology (Rotating Head)
• Stepper Motor (Steps across tracks)
• Multiple Heads Technology
• Introduced Servos and double steppers
• Less Density of discs and magnetic pits
• Higher Storage Capacity

6
Optical Storage Technology

• Heads move above the storage media
• Beam a laser down
• Reflectance of the beam identifies pits(1) and
  lands (0)
• Improvements
• On the Medium more versatility (Read/Write)
• On the reader the laser had a tighter focus
  (DVD)

7
Magneto Optical technology

• Storage capacity is like the optical devices
• The disc is covered with magnetically sensitive
  metallic crystals
• The Reader is a laser beam as for an optical
  device.
• They look identical to 3.5 floppy discs.

8
Recent Inventions

• Hologram
• The idea is that a crystal can contain memory in
  3D rather than 2D thus the information stored in
  a 1MM thick disk can contain 1000 times the
  information written on it CD style. The
  technology involves crossing one laser beam with
  another to view a string of light and dark which
  translates to binary. This is done inside a
  crystal and is theoretically very fast for both
  seek-time and access time in general.

9
Recent Inventions

• Memory Sticks
• Smaller than a stick of chewing gum, the 8 MB
  Memory Stick digital data storage systems have up
  to 10 times the storage capacity of a standard
  floppy disk, with the ability to interface with a
  potentially limitless number of audio/video
  products.
• This is like a chip set with ten pins. The size
  of Memory Stick is designed 21.5 mm (W) x 2.8 mm
  (H) x 50 mm (D), which depth of 50 mm is just
  same as an AA-size battery.

10
Current Status An Overview

• Flying heads are in generally accepted use.
• They are getting so close to the media that there
  are pseudo-flying heads, most of the time they
  fly, but in speed-up and slow down they slide
  with out damage to the media.
• Tapes are still used for back-ups though CD-R's
  are common as well.
• DVD is just becoming usable for denser read-only
  storage with Read/Write ability promised.

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Current Status An Overview

• HD-ROM takes the laser beam one step further.
• It uses an ion beam in a vacuum to drastically
  decrease the size of pits and lands with-out the
  smearing that happens in normal atmosphere.
  Corporations are continuing to by these
  advancements because they lead to cheaper and
  faster storage.
• Holographic crystals are used to store
  finger-prints in Japan, but still have not hit
  widespread use.

12
Key parameters for future development

• Flying heads will be improved to allow even more
  tracks in a disk,
• Optical laser beams can become even more focused
  (different frequency), Writing and re-writing
  becomes possible.
• Holograms (3-D) storage are under study and
  introduced in some markets as of 1996.
• More servo type information will be included to
  increase density of floppy's.

13
Limitations and Findings

• Disk drive technology as well as tape technology
  is slowly being replaced by optical storage.
• Limitations the read/write capabilities have
  just come out and are still very expensive
• Hologram technology has been studied since the
  1960's and progress in to making it a cheaper and
  common medium has farther to go.
• Limitations Too expensive to afford
• Needs a Higher Bandwidth
• Buses should be made of fiber optics
• Benefits Very High Storage capacity

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References and Links

• Peter Nortons Introduction to Computer / second
  edition. ISBN 0-07-115481-7
• Internet links
• http//www.cise.ufl.edu/alb/Arch3ref.html
• http//www.cise.ufl.edu/alb/Arch3.html
• E-mail Us
• 00102630_at_nsumail.agni.com
• 00104630_at_nsumail.agni.com
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