Secondary Storage

Secondary Storage

1. Optical(CD,DVD,Blu-Ray,HD DVD)

   • Used when some data needs to be used e.g a dvd or cd or blu ray
     • Uses a laser
   • Capacity
     • CD holds 650-700 MB of data
     • DVD holds about 4.7 GB
     • Blu-ray disc holds 25 GB

2. Magnetic(HDD)

   • These have are more storage capacity
     • Cost effective to a Solid State drive
       • It takes up more energy and isn't power efficient so isn't ideal for portable devices that run on battery
   • Used in desktop PCs and servers
     • They're plugged into the mains so they don't need power efficient storage

3. Solid State (SSD)

   • Solid state lasts longer than a magnetic hard drive
     • Hasn't got any moving parts
       • Solid state drives are commonly used in phones because they are more durable and it has a faster transfer speed
         • Used in mobile phone and high performance computers