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Primary/ Secondary Storage, :, Secondary Data is Non Volatile data (is…
Primary/ Secondary Storage
Primary
ROM
Read Only Memory, data which cannot be modified only read from.
BIOS
Run as soon as the PC turns on to conduct the mandatory checks followed by booting the installed Operating System IE: Windows/ MAC OS
Virtual Memory
Used when the RAM is full, data will be temporarily stored in the available drives.
RAM
Random Access Memory, used to store data which is currently in use, this data is stored in Binary (base 2) and is used to quickly recall data and store data.
Swapping, this is when the CPU requests data from the HDD or SSD and is sent to the RAM to be used in a program.
Secondary
Types of Devices
Hard Drive.
Cheap, can store lots of data, however is slower at accessing data than other devices.
USB Stick
Cheap, fast, portable but lacks data capacity.
Solid State Drive
Used for more demanding activities such as Gaming, SSDs have faster access to data however is more expensive than other devices.
Types of Storage P2
Magnetic
Have discs that store lots of data and have a moving part called the Read/Write head to get and overwrite data.
Optical Devices
Use lasers to read and write data, once the laser is shone it will reveal binary numbers which represent data.
ROM Media
Discs pre written with media which cannot be overwritten IE: Games, Films.
R (readable)
Empty disc which can be written to however cannot be overwritten but can be read many times.
RW (Readable, Writable)
Empty disc from the factory which can be written to and can read data from the disc, the data can be overwritten as many times as you may like unlike R.
:
Secondary Data is Non Volatile data (is stored when the PC is off)
Primary Data is Volatile meaning it is lost when the PC is off