Storage

Storage

1. Secondary storage

   • magnetic
     • advantages
       • quick to access
       • some are cheap
       • stores a large amount of data
     • disadvantages
       • data can be altered by magnetic fields
   • Non-Volatile
     • When the computer is turned off the data willbe saved
   • Optical
     • advantages
       • durable
       • transportable
       • good for archieving
     • disadvantages
     • example
       • CD
       • DVD
   • SSDs
     • advantages
       • good capacity
       • extremely portable
     • disadvantages
       • rebust
       • unreliable
     • Solid State Drives are made of flash memory, contain no moving parts and offer a much faster transfer rate than magnetic HDDs (around 550MB/s compared to 120MB/s for HDDs).
       • Flash memory has a higher cost-per-GB than Magnetic Hard Disks and can only be re-written a limited number of times, meaning that SSDs will start to degrade sooner than a Hard Disk would typically wear out, reducing their durability.
     • examples
       • smartphones
       • tablets