Computer system
Key components
Storage devices are used
to store program and data (Secondary Storage)
Memory allows the computer to store data it is using and processing (Primary) RAM- Random Access Memory
RAM is a volatile memory as
it can only store data temporarily.
Will disappear once power is off
Read-only-Memory (ROM)
Contains instructions to start the computer
Cache memory
Stores data the computers uses frequently
Faster than RAM
Data Units
File compression
Bit: Smallest unit of fata in a computer
Process of reducing the size of one or more files
Byte: Made up of eight bits
Kilobyte KB: 1,000 bytes
Megabyte: 1 MB 1,000 kB
Gigabyte GB: 1000MB
Terabyte TB: 1,000 GB
Petabyte: 1 PB 1,000 TB
Freeing up storage space
Ease of file transfer, as only a single compressed file
SD Card
Solid State Drive (SSD)
Thumb Drive
Secondary storage is non-volatile and permanent storage
Hard disk
Larger capacity and less expensive
Can be internal and external
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