What is a device queue?

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    What is a device queue?

    in operating system having different queues of processes is shown below: 

    Job Queue: Each new process goes into the job queue.Processes in the job queue reside on mass storage and the allocation of main memory is awaited. 

    Ready Queue: in main memory the set of all processes that waiting for CPU. time is kept in the ready queue. 

    Waiting (Device) Queues: The set of processes waiting for allocation of certain I/O devices is kept in the waiting (device) queue. Device Queue is the list of processes waiting for particular I/O devices.