A special fileis also called device file. It works as an interface between the devicedriver and system. They are Character devices, Block devices and Pseudo-devices.
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A block specialfile (block device) that provides access to a device that transfers in groupsof a fixed size. Block-driven is useful when you know how much data you canexpect, which is often the case with files on disk. The name “block device”comes from the fact that the corresponding hardware typically reads and writesa whole block at a time (e.g. a sector on a hard disk). For example, a hard disk,memory.
A character specialfile (character device) that provides access to a device that transfers inincrements of a single character. Character-driven is more practical when youdon’t know when your data will stop thus you keep it running until no morecharacters get through. The name “character device” comes from the fact thateach character is handled individually. For example, a terminal, keyboard,mouse.
Block special filesconsist of numbered blocks, each of which can be read or written independentlyof all the other ones. It is possible to seek to any block and start reading orwriting. This is not possible with character special files.
What is a special file? Define block special file and character special file with examples. What is the essential difference between a block special file and a character file?
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