1.2 - Memory 2.0

1.2 - Memory 2.0

1. RAM

   • Random Access Memory
     • Volatile
       • Data Currently in Use
       • Programs Currently in Use
       • Computer needs to be on to retain data

2. POST

   • Power On Self-Test
     • BIOS chip performs checks making sure components are working
       • OS Starts when tests are successful
       • Error Message appears if tests fail

3. Virtual Memory

   • Emulates RAM but is actually secondary storage
     • Data is stored here when RAM is full
       • Very Slow
     • Installed in the OS using VMM
       • Creates a file on the hard drive
         • OS can then address memory
           • Swapping or paging is used to move data from RAM and virtual memory
             • OS Moves un-needed data into the virtual memory on the hard disk
               • Transfer is made automatically as required

4. Flash Memory

   • Solid State Media (SSM)
     • No moving parts
       • USB drive
         • Advantages:
           • Lightweight
           • Carried Easily
         • Disadvantages:
           • Can get lost easily
           • Breaks over time