A device to which information is read and written in fixed-size blocks randomly accessible anywhere on the device.

As opposed to a CharacterDevice.

Common examples of BlockDevices are HardDisks, optical drives (CD/DVD readers/writers), memory-card readers (for e.g. SD cards, CF cards, xD cards) and USB storage devices (USB KeyDrives or external hard drives/optical drives).

See also DeviceDriver

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