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Chapter 7, SOLID STATE STORAGE(SSDS)lwz, Flash memory cards - Coggle…

- - - - Invisible wedge-shaped sections which divide from Tracks
    - - necessary to differentiate files stored on the same track and sectors of different platters
    - - Rings of concentric circles on the platter.
  - - - Head crash - disaster
        for a hard disk
        
        Occur when read-write head contact with particle on surface
        
        Rarely happen
  - - - Locate inside system unit
      - Store and retrieve large quantities of information quickly.
      - Do maintenance to ensure adequate performance
      - Cannot remove easily from system unit
      - Fixed amount of storage
    - - Connected to USB or Thunderbolt port
      - Easily removed
      - Slower access compare to internal hard disk
      - Fixed amount of storage
      - Useful to protect or secure sensitive information.
  - - - Acting as a temporary high-speed holding area between memory or secondary storage device and CPU
      - System performance if often increase by 30%
    - - Improve performance by expanding external storage, improving access speed and provide reliable storage.
      - Often used by Internet servers and large organization
    - - Speed up transmission of files from one
        computer system to another.
      - Increase storage capacity by reducing the
        amount of space required to store data and programs.
      - Often shrink files to a quarter of their
        original size.
- - - - Media-Physical materials
      - Capacity-larger storage capacity
      - Storage devices
      - Access speed
        
        Amount of time required to retrieve data from storage
        
        Writing is the process of saving information to storage
        
        Reading is the process of accessing information from storage
- - - - Holds over 128 GB of data
        
        Formats
        
        CD - RW
        
        Rewritable
        
        CD - ROM
        
        Read only
        
        CD- R
        
        Recordable
        
        Types
        
        Blu-ray
        
        50 GB capacity
        
        CD
        
        700 MB capacity
        
        DVD
        
        4.7 GB capacity