1.3 Storage

1.3 Storage

1. Secondary storage

   • Storage devices that store information, but do not lose the information when they are switched off

2. Optical Drive

   • Optical storage uses light from lasers to read and write data
   • CD
   • DVD
   • Blu-ray
   • least durable
   • least reliable
   • least expensive

3. Solid State

   • Solid state storage uses memory which can be programmed electronically
   • SD cards
   • USB drives
   • Micro SD cards
   • fastest speed
   • most portable
   • most reliable
   • most expensive

4. Magnetic Disk Drives

   • Magnetic disk drives read data using Electro-magnets in the read-write heads.
   • Hard disk drives
   • Magnetic tape
   • least portable
   • slowest speed
   • most durable

5. bit, nibble, byte, kilobyte, megabyte, gigabyte, terabyte

6. Non volatile storage