Memory and Storage

Memory and Storage

1. Read Only Memory (ROM)

   • Stored in a chip, that is directly connected to the CPU through dedicated buses. Can not be written to. Non - volatile
   • Has stored instructions on how to start the computer

2. Random Access Memory(RAM)

   • RAM holds data and instructions which the computer is using. It is Volatile.
   • Each programn that is being used is sent to the RAM

3. VIrtual Memory

   • RAM has a limited amount of space, so the operating system dedicates a small amount of secondary storage to be used as virtual memory
   • Flash Memory
     • Flash memory is used for easy and fast storage in computers, digital cameras and video games consoles

4. Optical Storage

   • A surface of a CD is coverded in microscopic dots, A laser would skim across it reading it. Several disks can be stacked for more storage
     • Pros:
       • Cheap, Portable, Data can't be ac
     • Cons:

5. Magnetic Storage

   • Magnetic Hard Drives use silver coloured disks which are covered in magnetic coating, A read/write head goes over it.

6. Solid State Storage

   • Solid State does not have any moving parts. Solid States are USBs and SD cards etc. They have switches inside which store 1 or 0

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