Unit 1.3 - {Storage}

Unit 1.3 - {Storage}

1. Types Of Storage

   • Optical
     • Definition: Device that uses a laser to read and write
     • Devices: Blu Ray DVD CD ROM
     • Characteristics: Cost is mid-range out of all three types of storage and is also mid-range when it comes to durability and portability
     • Has a large capacity
   • Magnetic
     • Definition: Read/write, move across the medium and change how magnetised that part of the medium is
     • Devices: Hard Disk Drive and Tape Drive
     • Characteristics: Has the best capacity, best cost and mid-range speed and portability
   • Solid-State
     • Definition: Made up of micro-chips (switches)
     • Devices: Solid State Drive, SD Card, USB Memory Stick
     • Characteristics: Has the best speed, portability, durability and reliability out of all three different types of storage
   • Storage Ranking

2. Six Characteristics Of Storage

   • Capacity: How much data it can store
   • Speed: How fast it accesses the data
   • Portability: How easy it is to move it from one place to another
   • Durability: How durable it is if dropped
   • Reliability: How well it consistently performs
   • Cost: How expensive it is per KB, MB and GB

3. What is Secondary Storage? Secondary storage is long term storage of data, files, software and OS

   • Why do we need to store them? To access it again later, to use software, to interact with the computer
   • What would happen without it? Software would need to be installed every time that you used it and you couldn't save any files, data, images or videos etc

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