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High Quality Content by WIKIPEDIA articles! In IBM mainframe operating systems from the z/OS line, a Unit Control Block (UCB) is a memory structure, or a control block, that describes any single input/output peripheral device, or a unit, to the operating system. A similar concept in Unix-like systems is a kernel's devinfo structure, addressed by a combination of major and minor number through a device node.

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High Quality Content by WIKIPEDIA articles! In IBM mainframe operating systems from the z/OS line, a Unit Control Block (UCB) is a memory structure, or a control block, that describes any single input/output peripheral device, or a unit, to the operating system. A similar concept in Unix-like systems is a kernel's devinfo structure, addressed by a combination of major and minor number through a device node.