1.3 Storage v2 Kwaku

1.3 Storage v2 Kwaku

1. Secondary Storage

   • Long term strage of data, files, software and OS
     • Stored so that we can use again later, to use the software and to be able to interact with the computer.
   • Without Secondary Storage, you couldn't save things like files, data, pictures or videos and software would need to be installed every time we used it
   • Backs up data
   • Offers more storage
   • Also known as auxiliary
   • Non-volatile
   • Helps you store large amounts of data
   • However, data may not be up to date

2. Types of Storage

   • Magnetic
     • Read/Write move across the medium and change how magnetised that section of the medium is.
     • Large capacity
     • It is slow to write/read.
   • Solid State
     • Made of microchips (switches)
       • State is determines if a 1 or 0 is stored
     • They are flexible, small, quick at accessing data and portable
   • Optical
     • A laser light forms marks on the disk
     • A laser light then detects the marksand translates it into a readable format
     • Cheap

3. Characteristics we look for in storage devices

   • Capacity
     • How much data can it hold?
     • The size of data/files being stored
   • Speed
     • How fast does it access data?
   • Durability
     • How likely is it to break?
     • The length The length of expected time for the data to learn.
   • Portability
     • How easy is it to move it around?
     • Whether it can move from one device to another
   • Reliability
     • How consistently does it perform?
     • Will it be saved as expected?
   • Cost
     • How much does it cost per KB, GB or MB?