I think the word you're wanting is 'peripherals' .
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depends on what you mean on computer system
The physical components that make ups computer system are the Central Processing Unit (CPU), the Hard Drive (data storage), the Motherboard, the Optical/Disc drives (CD readers and the like), the Power Supply Unit (PSU), the external parts (the case, speakers, monitor, mouse, keyboard, etc.) and numerous fans and cables inside the computer.
Computer equipment theft can be used in alternate terms. The theft of hardware is the visible components, the theft of software is theft of parts of the operating system.
"Computer equipment" is/are those physical devices/components that go into making a computer or peripherals that may be attached to a computer to make a "computer system" fit for purpose. The "computer equipment" would not normally include the software but a "computer system" would.
because the system unit contains everthing that helps the computer to work