A. Scheduling
B. Caching
C. Swapping
D. Spooling
The process of moving data from main memory (RAM - Random Access Memory) to a disk is called "paging out" or "swapping out." This activity is part of a computer's virtual memory management system. When a computer's physical RAM is insufficient to hold all the currently executing programs and data, the operating system may use a portion of the hard disk (or other storage) as virtual memory.