1.3 Storage

1.3 Storage

1. Types of Storage

   • Solid State
     • Made of Microchips
   • Optical
     • Another laser scans these and makes them into a readable format
     • A laser light leaves markings on a desk
   • Secondary
     • Without it, we can't store data files
   • Magnetic
     • Read/write makes certain parts more/less magnetised

2. Storage

   • Byte
   • Nibble
   • Kilobyte
   • Megabyte
   • Gigabyte
   • Terabyte
   • Petabyte

3. Data Types

   • Text- 1B/character
   • Date- 8B
   • Real- 4/8B
   • Boolean- 1B
   • Integer- 4/8B

4. Data Capacity

   • Text Files
     • 1 Byte/char +10% of any overheads
   • Sound
     • Bytes/sample * samples/second * channels * duration = size
   • Images
     • Number of Pixels * number of bytes per pixel + 10% any overheads

5. Storage Devices

   • Reliability
   • Capacity
   • Speed
   • Portability
   • Durability
   • Cost