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Block Devices read and write blocks of data and provide random access to data. Disk drives are the most common block devices.

Technotes Q&As Device Managers and Drivers     Inside Macintosh: Devices This book describes how to write software that interacts with built-in and peripheral hardware devices. This book provides useful information for writing and debugging low-level software. Chapter 3 includes a section that describes the structure of block devices and defines some terminology used in the documentation.