Disk I/O Operations Quiz
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Questions and Answers

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

  • Disk (correct)
  • RAM
  • CPU
  • Cache

    • What is the time it takes to position the head at the track known as in a movable-head system?

  • Data transfer time
  • Rotational delay
  • Access time
  • Seek time (correct)

    • What is the most commonly used I/O device for basic storage?

  • Keyboard
  • Printer
  • Disk (correct)
  • Monitor

    • What is the sum of seek time and rotational delay in disk performance parameters known as?

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

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

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

    What does the seek time consist of?

    <p>Initial start up time and time taken to traverse the cyclinders</p> Signup and view all the answers

    How is the transfer time to or from the disk calculated?

    <p>$T = \frac{b}{r \cdot N}$</p> Signup and view all the answers

    In sequential organization, what is the total time to read the first track of a file 128KB long stored on disk occupying 8 adjacent tracks?

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

    For a file 128 KB long stored on different locations on the disk with random organization, what is the total time to read all sectors?

    <p>7373ms</p> Signup and view all the answers

    What is the formula for estimated seek time?

    <p>$TS = m \cdot n \cdot s$</p> Signup and view all the answers

    What are the two key components of seek time?

    <p>Initial start up time and time taken to traverse the cyclinders</p> Signup and view all the answers

    What does the access time of a disk I/O operation include?

    <p>$TS + (1/2r) + [b / (r.N)]$</p> Signup and view all the answers

    What is the formula for calculating transfer time to or from the disk?

    <p>$T= b / (r \cdot N)$</p> Signup and view all the answers

    What does the total average access time consist of?

    <p>Ts + (1/2r) + [b / (r.N)]</p> Signup and view all the answers

    What is the average rotational delay for floppy disks?

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

    What does fragmented files on disk lead to?

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

    What is the sum of seek time and rotational delay in disk performance parameters known as?

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

    In sequential organization, what is the total time to read the first track of a file 128KB long stored on disk occupying 8 adjacent tracks?

    <p>$8 \times (\text{access time} + \text{seek time})$</p> Signup and view all the answers

    What does fragmented files on disk lead to?

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

    What are the two key components of seek time?

    <p>Head positioning and track selection</p> Signup and view all the answers

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

    <p>TS = m.n.s</p> Signup and view all the answers

    What is the formula for calculating the transfer time to or from the disk?

    <p>T = b / (r.N)</p> Signup and view all the answers

    What does fragmented files on disk lead to?

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

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

    <p>16.7ms</p> Signup and view all the answers

    What does the access time of a disk I/O operation include?

    <p>Seek time, rotational delay, and queuing delays</p> Signup and view all the answers

    What are the two key components of seek time?

    <p>Initial start up time and rotational delay</p> Signup and view all the answers

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

    <p>Hard Drive</p> Signup and view all the answers

    What is the time it takes to position the head at the track known as in a movable-head system?

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

    What is the sum of seek time and rotational delay in disk performance parameters known as?

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

    What does the total average access time consist of?

    <p>Seek time, rotational delay, and transfer time</p> Signup and view all the answers

    What does the seek time consist of?

    <p>Initial start up time and traversal time</p> Signup and view all the answers

    In sequential organization, what is the total time to read the first track of a file 128KB long stored on disk occupying 8 adjacent tracks?

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

    Study Notes

    Disk Storage Basics

    • Hard disk drive (HDD) is the basic storage device for the O.S., application software, and data.
    • Seek time is the time required to position the read/write head over the desired track in a movable-head disk system.
    • Hard disk drive (HDD) is the most commonly used I/O device for basic storage.
    • Latency is the sum of seek time and rotational delay in disk performance parameters.
    • Average rotational delay for disks other than floppy disks is 8.33 msec (half the time of one rotation).

    Disk Access Time

    • Seek time consists of positioning time (moving the head to the correct track) and settling time (allowing the head to settle).
    • Transfer time is calculated by dividing the number of bytes to be transferred by the transfer rate of the disk.
    • Average rotational delay for floppy disks is 100 msec (half the time of one rotation).
    • Total average access time consists of seek time, rotational delay, and transfer time.
    • Fragmented files on disk can lead to increased access time due to the head having to move across multiple tracks to read or write the file.

    Reading Files on Disk

    • Sequential organization refers to storing data in consecutive tracks on the disk. To read the first track of a file 128KB long stored on disk occupying 8 adjacent tracks, it takes only the time to access the first track, which is the sum of seek time and rotational delay.
    • Random organization refers to storing data in non-consecutive locations on the disk. To read all sectors of a file 128KB long stored on disk occupying 8 adjacent tracks, it takes the time to access each individual sector, which is the sum of seek time and rotational delay for each sector.
    • Estimated seek time can be calculated using this formula: average seek time + (0.5 * (shortest seek time - longest seek time))

    Seek Time Components

    • Seek time has two key components: positioning time and settling time.
    • Access time of a disk I/O operation includes seek time, rotational latency, and transfer time.

    Transfer Time Calculation

    • Transfer time to or from the disk is calculated by dividing the number of bytes to be transferred by the transfer rate of the disk.

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    Related Documents

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    Description

    Test your knowledge of disk I/O operations with this quiz. Explore the details of disk I/O transfer, including the wait for device, wait for channel, seek, rotational delay, and data transfer processes.

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