Question

Explain the following functions of an operating system:
(a) Memory Management
(b) File Management

Hint:

To distinguish between the two: Memory Management handles volatile, high-speed RAM space where active processes execute, while File Management handles non-volatile, persistent storage drives where files are saved long-term.

Answer 1

Step 1: The Core Role of an Operating System (OS):
An Operating System acts as an intermediary layer between computer hardware and user software applications. To run programs efficiently, it manages the computer's hardware resources.

Step 2: Explaining Memory Management:
Memory Management refers to the process of controlling, coordinating, and optimizing the computer's primary volatile memory (RAM) during system operations.
• Allocation & amp; Deallocation: The OS allocates specific memory spaces to active program processes to ensure they have the resources to run. Once a process finishes executing or is closed, the OS reclaims (deallocates) that memory space so other programs can use it.
• Tracking State: The OS keeps an internal record of which memory addresses are currently allocated to active processes and which addresses remain free.
• Isolation and Protection: It creates strict memory boundaries between running applications. This prevents one program from reading or writing data to another program's allocated memory space, avoiding system instability and security breaches.

Step 3: Explaining File Management:
File Management is the process by which the operating system organizes, controls, tracks, and manipulates files stored on non-volatile, secondary storage media (such as HDDs, SSDs, or optical drives).
• Logical Abstraction: It abstracts raw physical storage blocks into easy-to-use logical folders (directories) and files.
• CRUD Operations: It handles the operational APIs for creating, reading, updating, renaming, and deleting files.
• Directory Indexing: The OS maintains a file allocation table or directory index (e.g., NTFS, FAT32, ext4 file systems) to map logical file paths to their exact physical sectors on the disk.
• Access Controls: It enforces security permissions on files, checking whether a specific user or application has permission to Read, Write, or Execute a given file.