Secondary storage

  • Created by: Tomiwaq
  • Created on: 25-03-19 19:28
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  • Secondary storage
    • Two storage types
      • Primary storage
        • Memory areas that the CPU can access
          • Cache
          • ROM
          • RAM
          • Volatile
          • Fastest read / write
      • Secondary storage
        • Where all data are stored when not in use
          • Magnetic hard disk drives
          • Solid state drives
          • CD's
          • SD cards
          • Read / write speeds are much slower
    • Hard disk drives
      • Traditional internal storage devices in PCs and laptops
      • Made up of a stack of magnetic metal disks
      • Data is stored magnetically in sectors within circular tracks.
      • Portable HDDs are popular for backing up and transporting large amounts of data
      • HDDs are very long lasting and reliable
      • Can be broken by large impacts
      • Make noise due to moving parts
    • Solid state drives
      • Contain no moving parts
      • Most use flash memory
      • Faster read / write than HDD
      • Quicker boot up and opening files
      • Portable SSDs can be used to back up and transport data
      • Silent because of no moving parts
      • More shockproof than HDDs
    • Optical drives
      • CDs
      • DVDs
      • Blu-ray
      • Read-only
        • CD-ROM
        • DVD-ROM
        • BD-ROM
      • Write-once
        • CD-R
        • DVD-R
        • BD-R
      • rewritable
        • CD-RW
        • DVD-RW
        • BD-RW
      • They are very cheap
      • They are portable
      • Waterproof and shockproof
    • Magnetic tapes
      • Greater storage capacity
      • Low cost
      • Used in archive libraries to store large amounts of data
      • Comes in plastic cassettes
      • Slow to find specific data

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