2

Primary: CPU has direct access to (registers, cache, ROM & RAM) Volatile ( only on with power) Fast read/write speed Secondary: not directly accessible Non-volatile Where data is stored when not in use Slow read/ write speed

Made up of magnetised metal disks spinning . 1 &0 for magnetised and demagnetised Data is stored in sectors , on tracks. Read write head on a movable arm accesses these sectors. Long lasting( but moving parts), cheap, large capacity

Drive: Data stored in electrical circuits, by tapping electrons. (Transistors) Fast read write time. Don’t need defragmentation More long lasting, no heat no moving parts, Silent

Eg: CD, DVD, blue Ray Pits/ (0)holes are made, the reflected beam from laser read is the data Low capacity, cheap, portable , slow read/write

Data is uploaded via the internet to a remote server (stored on HDD/SSD) . You pay with a subscription.

Communicating with input output devices/ via device driver Process manager- CPU and it’s time with programs Providing a platform for applications to run Memory management- how much RAM a program has access to File management-read/write/delete System management- user passwords

To store long term Retains data when no power (non-volatile) High capacity

How much physical damage it can take without breaking

Solid Magnetic Optical

And- D Not-triangle &circle Or- arrow head XOR- arrowhead with line, does not accept two trues

2 * * number of inputs Eg: 2* * 3 =8 2**2= 4

Not= line overhead And = . Or= + Not or = circle over +

:)can be accessed from anywhere, data can be shared , cheap, provides back up/security :( need Wi-Fi, data vulnerable to hackers,