Block Driver

A Linux block device is a type of device that allows data to be read from or written to in fixed-sized blocks, typically used for storage devices like hard drives or solid-state drives.
A Linux block driver is a software component that facilitates communication and control of block devices, handling the read and write operations of fixed-sized blocks of data between the operating system and storage devices.
Block drivers are more complicated than char drivers because they should implement advanced buffering strategies to read from and write to the block devices, which involves disk caches.
Examples: Mass storage devices such as hard disks, SDMMC, NAND Flash, USB camera, etc.