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Secondary Storage - Coggle Diagram

- - - - disk is divided into concentric rings called tracks
      - each track is divided into number of sub tracks
    - - drive maintains and internal table which holds the sectors which cannot be read/write due to surface imperfections
    - - refers to numbering of sectors located in disk
    - - amount of information that can be transferred in or out of the memory in a second
      - speed depends on
        
        bandwidth
        
        average data rate during a large tranfer
        
        access latency
    - - refers to speed of rotation of disk
    - - components
        
        seek time
        
        latency time
      - time required between request made for read /write operation
  - - - maps the usage of data space on a disk
      - contains information about the space used by each individual file
- - - - large storage capacity
      - mass replication is inexpensive and fast
      - suitable for archival storage
    - - read only, cannot be updated
      - access time is longer than magnetic disk
      - slow compared to hard disk
    - - its diameter is 5.25 inch
      - can store 650 mb
      - information is written by creating pits on disk surface