8 - MulitimediaComputing OnlineLecture8 LearningObjectives:

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Mulitimedia Computing Online Lecture-8 Learning Objectives: Data Storage and Optical  Storage  Solution to Some Problems Some Recommended  Problems Instructor-in-Charge Dr. Mukesh Kumar  Rohil WILPD, BITS, Pilani Rajasthan Monday, March 15, 2010 WILPD, B.I.T.S., PILANI EA ZC473 Multimedia Computing On-Line Lecture-8 1
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Optical Storage Media and  Why optical? How data is  represented? CD-ROM CD-WORM CD/RW Multi spirals  Optical Vs Magnetic  Storage Other types of storage Monday, March 15, 2010 2 WILPD, B.I.T.S., PILANI EA ZC473 Multimedia Computing On-Line Lecture-8
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Storage Technology Magnetic Media 1. Floppy Disk 2. Hard Disk Components of Floppy Disk 1. sheet of gelatin/plastic  coated (one side or both sides)  with magnetic material 2. Index hole 3. Read/write notch (below the  shutter) 4. Hub ring or spindle hole Tracks and Sectors Uniform angular velocity Read/write head (in physical  contact) Monday, March 15, 2010 3 WILPD, B.I.T.S., PILANI EA ZC473 Multimedia Computing On-Line Lecture-8
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Hard Disks A number of platters coated with magnetic  media Spindle Arm actuator Read/write head assembly Head, Cylinder, and Sectors Uniform Angular Velocity Writes interleaved with reads Monday, March 15, 2010 4 WILPD, B.I.T.S., PILANI EA ZC473 Multimedia Computing On-Line Lecture-8
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Hard disks Latencies - To seek a cylinder  - To seek a sector-on the head given the  cylinder - To read/write the sector Monday, March 15, 2010 5 WILPD, B.I.T.S., PILANI EA ZC473 Multimedia Computing On-Line Lecture-8
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Optical Storage Types CD-ROM (Compact Disk  Read Only Memory) - Pre-mastered - Recordable WORM (Write once read  many [times]) RW (Rewritable) Magneto-optical  Technology Phase change RW optical  disk Dye polymer RW disk Advantages Ease of use and durability  of media Random access Very high sound fidelity High storage volumes No affect of magnetic  fields and water Monday, March 15, 2010 6 WILPD, B.I.T.S., PILANI EA ZC473 Multimedia Computing On-Line Lecture-8
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Pre mastered CD-ROM (Physical  Layers) Protective Coat of Lacquer Reflective Aluminum Layer LAND PIT LAND PIT LAND Polycarbonate Substrate Monday, March 15, 2010 7 WILPD, B.I.T.S., PILANI EA ZC473 Multimedia Computing On-Line Lecture-8
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CD-ROM Consists of a single Spiral track (centre to outer 
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This note was uploaded on 03/14/2010 for the course CSE EA ZC473 taught by Professor Rahulbanerjee during the Summer '10 term at Birla Institute of Technology & Science.

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8 - MulitimediaComputing OnlineLecture8 LearningObjectives:

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