Storage information

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  • Created by: benjacko
  • Created on: 12-02-16 10:59
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  • Storage information
    • Flash memory
      • USB Memory sticks
        • Flash memory connected to a USB interface
        • Can be used to move any type of file between computers
        • Cheaper than other devices such as Hard disks dependent on the capacity of the memory unit
        • Average capacity of around 8-16GB
      • Memory cards
        • Small flash memory chips used in cameras, phones, Mp3 players
        • Examples include SD cards
    • Magnetic storage
      • Floppy disk
        • 1.44mb storage
        • Small storage allows for small files to be backed up
        • Can only be read and accessed by a floppy disk drive
        • Portable, therefore files can be transferred and backed up on other computers
      • Fixed hard disk
        • 2 Terrabytes or more in size
        • Useful for storing large amounts of data such as operating systems, software and programs
        • Suitable for applications that require fast access to data for reading and writing to
        • Data can be accessed quicker than floppy disks, CDs and DVDs
        • Not portable in any way as it is fixed inside of the computer
        • Slower transfer rate than solid state devices
        • Will slow down in performance when running out of storage space
        • Fragile/must be handled with care
      • Portable hard disks
        • 2 Terrabytes or more in storage
        • Used to store large personal files such as images or videos
        • Faster/more reliable access than floppy disks
        • Portable storage device, unlike the fixed hard disk
        • Slows down when running out of storage space
        • Fragile/must be handled with care
    • Optical memory
      • Read only disks
        • CD-ROM
          • Compact read-only disc, therefore data cannot accidentally edited or deleted
          • Holds around 800mb of data
          • Can be used to store data such as software (games and office applications), music and sound/video
          • Requires and PC and optical drive to access data
          • Cheaper than magnetic media
          • Data can be rendered unreadable if scratched
        • DVD-ROM
          • Around 4.7gb Storage
          • More storage than CD-ROMs, therefore they can be used to store and transfer high-quality videos
          • Slower transfer rate than hard disks
      • High capacity optical disks
        • Blu-ray
          • Holds 25-50GB of data
          • Used in the same way as DVD-ROMs, except they can also be used to store very high quality videos/films
        • HD-DVD
          • Holds around 15GB of data
          • Used to store high quality videos in the same way as Blu-ray
      • Recordable optical disks
        • CD-R and DVD-R
          • Data can be written onto them, but not erased
          • Data can be added until the disc is full, however this cannot be removed and the disk cannot be reused
          • Around 650mbs of storage for CD-R, whilst 4.7GB for DVD-R
        • CD-RW and DVD-RW
          • CD Rewritable and DVD rewritable can have data burnt onto them and also erased so that the disc can be reused
          • CD-RW has a capacity of 700MB whilst DVD-RW has 4.7GB
    • Durability - how long the device will last dependent on its lifecycle and ability to withstand damage
    • Speed - how quick the data can be accessed on the device
    • Portability - how easily the device can be carried and transferred between systems
    • Reliability - how reliable the device is in terms of protecting stored data

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