1.2 Memory & 1.3 Storage

1.2 Memory & 1.3 Storage

1. primary storage

   • Why is it needed?
   • Virtual memory
     • This is used when the memory in RAM runs out and the PC uses part of the HDD instead
   • RAM (Random Access Memory
     • Is a device that you can plug into the motherboard. It contains programs and instructions that are currently being worked at
   • ROM (Read only memory
     • Is usually a flash memory chuip on the motherboard that contains instructions needed to start up (boot) the computer
   • Flash Memory
     • This type of memory is solid state (No moving parts) that remains data even when the power is removed. It is used in SSDs and memory cards.
   • Refers to the memory areas in the CPU can access very quickly

2. Why is it needed?

   • Secondary Storage
     • Characteristics
       • Capacity
         • "How much can the storage device hold?"
       • Speed
         • "How fast can data be written?"
       • Portability
         • "Can you unplug/carry it around?"
       • Durability
         • "How long is the product expected to function for before it is no longer usable?"
       • Reliability
         • "How likely is that the product will fail its lifespam?"
       • Cost
         • "How expensive is the storage device per GB
     • Optical
       • CD
       • DV
       • A form of storage that uses light/lasers to read and write data
     • Magnetic
       • Tape
       • HDD
       • A form of storage that uses magnetism to write and read data
     • Solid state
       • SSD
       • USB
       • A form of storage that used flash memory and chips to store data
     • This is non-volatile storage. Its were all data (operating systems, applications and user filters) are stored when not in use.