Block Devices
Block devices are a type of computer storage device that reads and writes data in fixed-size blocks, typically 512 bytes or 4KB, and are accessed as a raw sequence of bytes. They provide low-level, direct access to storage media, such as hard drives, SSDs, and USB drives, and are managed by the operating system's block layer. This concept is fundamental in storage systems, enabling file systems, databases, and other applications to interact with physical or virtual storage.
Developers should learn about block devices when working on system-level programming, storage management, or performance optimization, as they form the foundation for data persistence and I/O operations. This knowledge is crucial for tasks like disk partitioning, file system implementation, database storage engines, and virtual machine disk management, where direct control over storage blocks is required for efficiency and reliability.