Storage facility

The storage unit is one of the four main components of a Von Neumann computer . The control unit fetches commands and data from the main memory . The commands are interpreted in the control unit and the data processed in the arithmetic unit . In contrast to the Harvard architecture , the Von Neumann architecture contains data and commands in the same memory.

In modern PCs, the storage unit consists of the actual memory ( RAM ) and the memory logic ( Northbridge ). The EPROM memory ( BIOS ) is only used when the PC is booted and is otherwise of no importance. Hard disk storage does not belong to the storage unit, but to the input / output unit , because the data is first loaded from the hard disk into the main memory before it can be processed.