I/O Management Categories Quiz
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Questions and Answers

What is the purpose of a Line Printer as mentioned in the text?

  • Output (correct)
  • Machine
  • Storage
  • Input

    • Which category of external devices is suitable for transferring and receiving data between remote devices?

  • Machine readable
  • Voice Output
  • Communication (correct)
  • Human readable

    • What is the data rate for Optical Disk as listed in the text?

  • 500 KB/s
  • 0.01 KB/s
  • 2000 KB/s (correct)
  • 1 KB/s

    • Which I/O operation technique requires the processor to continuously test the I/O register for device status?

    <p>Programmed I/O</p> Signup and view all the answers

    What does Direct Memory Access (DMA) allow?

    <p>Transfer data between memory and I/O devices without requiring the processor's active intervention</p> Signup and view all the answers

    What is the purpose of Interrupt Driven I/O?

    <p>To allow the processor to do other tasks while data transfer is still in progress</p> Signup and view all the answers

    What is the function of Double Buffering?

    <p>Assigns two buffers to an I/O operation</p> Signup and view all the answers

    What is the purpose of I/O Buffering?

    <p>Reduce the impact of relatively slow devices on processor efficiency</p> Signup and view all the answers

    In systems where rapid bursts of I/O are expected, what can be used to ensure a smooth flow of data through I/O devices?

    <p>Double Buffering</p> Signup and view all the answers

    How does Single Buffering work?

    <p>Allows the process to continue processing while the next block is being read in</p> Signup and view all the answers

    Which type of device performs I/O operations as streams of data?

    <p>Stream-oriented Devices</p> Signup and view all the answers

    What do block-oriented devices use for improving efficiency in I/O operations?

    <p>Double Buffering</p> Signup and view all the answers

    What type of device uses streams of data for I/O operations?

    <p>Stream-oriented Devices</p> Signup and view all the answers

    What allows a smooth flow of data through I/O devices in systems with rapid bursts of I/O?

    <p>Double Buffering</p> Signup and view all the answers

    Which type of device uses blocks for I/O operations?

    <p>Block-oriented Devices</p> Signup and view all the answers

    What type of data are suitable for communicating with electronic equipments like disks, tapes, controllers, and sensors?

    <p>Machine readable data</p> Signup and view all the answers

    Which I/O operation technique requires the processor to continuously test the I/O register for device status?

    <p>Programmed I/O</p> Signup and view all the answers

    What is the purpose of Double Buffering in I/O operations?

    <p>To allow simultaneous data transfer</p> Signup and view all the answers

    What is the function of Line Printer as mentioned in the text?

    <p>Output</p> Signup and view all the answers

    Which I/O technique allows the processor to do other tasks while data transfer is still in progress?

    <p>I/O Buffering</p> Signup and view all the answers

    What type of devices perform I/O operations as streams of data, with double buffering offering twice as much data and twice the transfer speed compared to single buffering?

    <p>Stream-oriented Devices</p> Signup and view all the answers

    In systems where rapid bursts of I/O are expected, what can be used to ensure a smooth flow of data through I/O devices?

    <p>Circular Buffer</p> Signup and view all the answers

    What is the function of Double Buffering in I/O operations?

    <p>To assign two buffers to an I/O operation</p> Signup and view all the answers

    Which I/O operation technique requires the processor's active intervention for data transfer between memory and I/O devices?

    <p>Direct Memory Access (DMA)</p> Signup and view all the answers

    What is the purpose of Interrupt Driven I/O?

    <p>To allow the processor to do other tasks while data transfer is in progress</p> Signup and view all the answers

    What is the main role of an I/O Processor in advanced systems?

    <p>To take care of most tasks involved in controlling the communication between memory and I/O devices</p> Signup and view all the answers

    How does Single Buffering work in I/O operations?

    <p>The operating system assigns a buffer in main memory to an I/O request.</p> Signup and view all the answers

    Which category of external devices is suitable for transferring and receiving data between remote devices?

    <p>Block-oriented Devices</p> Signup and view all the answers

    What do block-oriented devices use for improving efficiency in I/O operations?

    <p>Double Buffering</p> Signup and view all the answers

    What are circular buffers used for in systems with rapid bursts of I/O?

    <p>To assign more than two buffers for a smooth flow of data.</p> Signup and view all the answers

    What allows data transfer between memory and I/O devices without requiring the processor's active intervention?

    <p>Direct Memory Access (DMA)</p> Signup and view all the answers

    What is the term for the time it takes to position the head at the track on a movable-head disk system?

    <p>Seek time</p> Signup and view all the answers

    What is the term for the time it takes for the beginning of the sector to reach the head on a disk drive?

    <p>Rotational delay</p> Signup and view all the answers

    What is the sum of seek time and rotational delay known as in disk I/O operations?

    <p>Access time</p> Signup and view all the answers

    What is the basic storage device where the O.S., application software, and data are kept?

    <p>Disk I/O</p> Signup and view all the answers

    What is the purpose of the seek time in a disk I/O operation?

    <p>To move the disk arm to the required track</p> Signup and view all the answers

    What component of seek time consists of initial start up time and the time taken to traverse the cylinders?

    <p>Traversing time</p> Signup and view all the answers

    What does the rotational delay depend on for disks other than floppy disks?

    <p>Rotation speed in revolutions per second</p> Signup and view all the answers

    How is the transfer time to or from the disk dependent on the rotation speed of the disk?

    <p>Inverse proportional</p> Signup and view all the answers

    For a file stored in a sequential organization, what is the total time to read the entire file if it occupies 8 adjacent tracks?

    <p>220 ms</p> Signup and view all the answers

    In a random organization of storing a file on different locations on the disk, what is considered as effective for each sector?

    <p>Average seek time</p> Signup and view all the answers

    What is the term for the time it takes for the beginning of the sector to reach the head on a disk drive?

    <p>Rotational delay</p> Signup and view all the answers

    What is the purpose of Interrupt Driven I/O?

    <p>To require the processor's active intervention for data transfer between memory and I/O devices</p> Signup and view all the answers

    What is the function of Line Printer as mentioned in the text?

    <p>To perform I/O operations as streams of data</p> Signup and view all the answers

    What does Direct Memory Access (DMA) allow?

    <p>It allows data transfer between memory and I/O devices without requiring the processor's active intervention</p> Signup and view all the answers

    What is the estimated seek time formula for a disk drive?

    Signup and view all the answers

    What is the rotational delay for disks other than floppy disks?

    <p>8.3ms</p> Signup and view all the answers

    What is the transfer time formula to or from the disk dependent on?

    <p>Number of bytes to be transferred</p> Signup and view all the answers

    What is the total time to read the first track of a file stored in sequential organization?

    <p>45 ms</p> Signup and view all the answers

    What is the effect of fragmented files on disk access?

    <p>Slower access to scattered sectors</p> Signup and view all the answers

    What can be used to avoid fragmentation on disk?

    <p>Disk defragmentation</p> Signup and view all the answers

    What does the seek time for a disk drive consist of?

    <p>Start up time and rotation time</p> Signup and view all the answers

    What is the average rotational delay for disks other than floppy disks?

    <p>~8.3 ms</p> Signup and view all the answers

    What is the purpose of Interrupt Driven I/O?

    <p>To enable parallel I/O operations</p> Signup and view all the answers

    What is the purpose of Double Buffering in I/O operations?

    <p>To allow simultaneous write and read operations</p> Signup and view all the answers

    What type of devices perform I/O operations as streams of data?

    <p>Character-oriented devices</p> Signup and view all the answers

    Study Notes

    • Interrupt Driven I/O: I/O devices send interrupts to the processor when the job is finished, allowing the processor to do other tasks while data transfer is still in progress.

    • Direct Memory Access (DMA): A module called DMA can be used to transfer data between memory and I/O devices without requiring the processor's active intervention.

    • I/O Buffering: Buffering is used to reduce the efficiency loss that occurs when processors perform I/O operations involving relatively slow devices.

    • Single Buffering: In single buffering, the operating system assigns a buffer in main memory to an I/O request, allowing the process to continue processing while the next block is being read in.

    • Double Buffering: Double buffering assigns two buffers to an I/O operation, allowing data transfer while the other buffer is being filled.

    • Circular Buffer: In systems where rapid bursts of I/O are expected, more than two buffers can be used in a circular buffer to ensure a smooth flow of data through I/O devices.

    • Block-oriented Devices: I/O operations for block-oriented devices are performed as blocks, making single and double buffering effective strategies for improving efficiency.

    • Stream-oriented Devices: I/O operations for stream-oriented devices are performed as streams of data, and double buffering offers twice as much data and twice the transfer speed compared to single buffering.

    • I/O Processor: Advanced systems may employ I/O processors, which are computers in their own rights and take care of most tasks involved in controlling the communication between memory and I/O devices.

    • Interrupt Driven I/O: I/O devices send interrupts to the processor when the job is finished, allowing the processor to do other tasks while data transfer is still in progress.

    • Direct Memory Access (DMA): A module called DMA can be used to transfer data between memory and I/O devices without requiring the processor's active intervention.

    • I/O Buffering: Buffering is used to reduce the efficiency loss that occurs when processors perform I/O operations involving relatively slow devices.

    • Single Buffering: In single buffering, the operating system assigns a buffer in main memory to an I/O request, allowing the process to continue processing while the next block is being read in.

    • Double Buffering: Double buffering assigns two buffers to an I/O operation, allowing data transfer while the other buffer is being filled.

    • Circular Buffer: In systems where rapid bursts of I/O are expected, more than two buffers can be used in a circular buffer to ensure a smooth flow of data through I/O devices.

    • Block-oriented Devices: I/O operations for block-oriented devices are performed as blocks, making single and double buffering effective strategies for improving efficiency.

    • Stream-oriented Devices: I/O operations for stream-oriented devices are performed as streams of data, and double buffering offers twice as much data and twice the transfer speed compared to single buffering.

    • I/O Processor: Advanced systems may employ I/O processors, which are computers in their own rights and take care of most tasks involved in controlling the communication between memory and I/O devices.

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    Description

    Test your knowledge on the categories of external devices that engage in I/O operations with a computer's CPU. Learn about human readable, machine readable, and communication materials produced by different devices.

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