Secondary Storage

Secondary Storage

1. Magnetic Storage

   • Disadvantages
     • Not Portable
     • Not as durable due to moving parts
     • Data Transfer speed is slower in comparison to Solid State
   • Seagate 3TB, Cost £72.99, Read Speed 159MB/s, Write Speed 148MB/s, Cost Per GB £0.02
   • Advantages
     • High capacity (stores a lot of data)
     • Cost effective due to having a larger capacity than Solid State
       • For when you need lots of storage space

2. Optical storage

   • CD, DVD & Blu-ray £0.20, £0.20, £0.80 700MB, 4.7GB, 25GB-100GB
   • Read by a laser beam
   • Disadvantages
     • Not very durable therefore it isn't very hard
     • It has limited capacity
   • Advantages
     • Very portable
     • Cost effective when you need to make multiple copies of a file for other people to use

3. Solid State (Flash) Storage

   • Advantages
     • Store data PERMANENTLY
     • Portable therefore the storage device can be used on other devices
     • More durable
     • Much faster than magnetic
     • Read/write speed is much faster than magnetic
     • Cost effective if you need high performance in order to be productive in your job
   • Examples
     • SanDisk 240GB, Cost £75.98, Read Speed 550MB/s, Write Speed 500MB/s, Cost per GB £0.32
     • USB stick: used to transport data from one computer to another
     • SD card: normally found in devices such as cameras and smartphones
   • Disadvantage
     • Less cost effective in comparison to magnetic because it has a much smaller capacity
     • Limited read/write lifespan