📖 10. Mass Storage Structure

📖 From Operating System • 360 questions available

About 10. Mass Storage Structure

Mass storage refers to the permanent storage devices in a computer, like Hard Disk Drives (HDDs) and Solid-State Drives (SSDs). These are the "filing cabinets" of the computer where you save all your files, programs, and the OS itself, even when the computer is turned off. The OS manages these devices, organizing the vast amount of data so that it can be stored efficiently and retrieved quickly. The structure of these devices, particularly HDDs with spinning platters and moving read/write heads, heavily influences how the OS performs I/O (input/output) operations.

The OS views a storage device as a logical block of memory, but the physical reality is more complex, especially for HDDs. To improve performance, the OS uses scheduling algorithms to order requests to the disk, such as using "elevator algorithms" that move the read/write head in one direction to service requests, minimizing unnecessary movement. For SSDs, which have no moving parts, the management focuses on wear leveling to extend the drive's life. The OS's job is to abstract the physical complexity and provide a simple, efficient way for users and applications to store and retrieve data permanently.

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🔄 Last updated: 2026-07-26