📖 8. Main Memory

📖 From Operating System • 370 questions available

About 8. Main Memory

Main memory, often called RAM (Random Access Memory), is the workspace of the computer. It is a fast, temporary storage area where the OS and all currently running programs and their data must reside so the CPU can access them quickly. Unlike your hard drive, which stores data permanently, memory is volatile, meaning its contents are lost when the computer is turned off. The OS is in charge of managing this precious and limited resource, deciding which parts of memory are allocated to which process.

The OS uses a technique called "memory management" to keep track of every byte of memory. It ensures that processes don't interfere with each other's memory space. To do this efficiently, it often uses "paging," where memory is divided into small, fixed-size blocks called frames, and the process is divided into blocks of the same size called pages. This allows the OS to store a process's pages anywhere in memory, making the management of memory more flexible and efficient, so the system can run multiple programs smoothly.

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🔄 Last updated: 2026-08-07