Computer Memory and Storage

A page table is the data structure used by an operating system in a virtual memory system to store the mapping between virtual addresses and physical addresses.

First-In-First-Out (FIFO) is a simple page replacement algorithm that replaces the page that has been in memory the longest.

In paging, the virtual address space is divided into fixed-size blocks called pages, which correspond to physical frames.

A file is the standard unit of storage for logically related data on secondary storage devices.

On a magnetic disk, data is organized into concentric circles known as tracks.

A cylinder is a collection of all tracks that are at the same radial distance from the center across all surfaces of a disk pack.

Fixed-head disks have a dedicated read/write head for every track, which eliminates the seek time required to move a head to a specific track.

Moving head disks, such as standard hard disk drives, use an actuator arm to position read/write heads over specific tracks. Fixed head disks use a dedicated head for every track, which is a different architecture.

Storage systems are generally categorized by their persistence, including volatile (RAM), non-volatile (HDD/SSD), and stable storage (redundant systems), making all of these valid classifications.

WORM is a data storage technology that allows data to be written to a storage medium a single time and prevents the drive from erasing the data.

A file service is the interface that defines the operations available to clients for accessing and manipulating files within a distributed file system.

Drive bays in a computer chassis are designed to hold various storage devices like CD drives, floppy drives, and hard disks.