Chapter goals


Segmented memory Each application has unique starting address



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Data storage

Segmented memory

Each application has unique starting address

Magnetic storage

  • Uses magnetism to store binary information onto a storage medium that can store magnetic information
  • Least expensive medium for secondary storage
  • Can be portable
  • Retains data without electricity
  • Over longer periods of time will eventually lose information

Read/write in magnetic device

Magnetic decay and leakage

  • Primary disadvantage is loss of data over time
  • Magnetic Decay – the tendency of magnetically charges particles to lose their charge over time
  • Magnetic Leakage – a decrease in the strength of individual bit charges

Magnetic storage

Organization of tracks and sectors

Optical mass storage devices

  • Advantages:
    • Higher recording density
    • Longer data life
    • Retain data for decades
    • Not subject to problems of magnetic decay and leakage

Optical storage

  • Optical storage devices store bit values as variations in light reflection.
  • Storage medium is a surface of highly reflective material.
  • The read mechanism consists of a low-power laser and a photoelectric cell.

Storing binary information

Examples of optical devices

Chapter summary

  • A typical computer system has primary and secondary storage devices
  • The critical performance characteristics of primary storage devices are their access speed and the number of bits that can be accessed in a single read or write operation

Summary cont.

  • Programs generally are created as through they occupied contiguous primary storage locations starting at the first location
  • Magnetic storage storage devices store data bits as magnetic charges
  • Optical discs store data bits as variations in light reflection

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