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The interval between the instant a computer makes a request for the transfer of data from a disk system to the primary storage and the instance this operation is completed is called _________.
- a)Disk arrival time
- b)Disk access time
- c)Drive utilization time
- d)Disk utilization time
- e)None of these
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
The interval between the instant a computer makes a request for the t...
The interval between the instant a computer makes a request for the transfer of data from a disk system to the primary storage and the instance this operation is completed is called Disk access time. Disk access time is always given as an average, because seek time and latency vary depending on the current position of the head and platter. Like access times of fast hard disks are typically from 5 to 10 milliseconds, solid state drive (SSD) access times are in the 25 to 100 microsecond range.
Hence, the correct option is (B).
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The interval between the instant a computer makes a request for the t...
Disk access time refers to the interval between the moment a computer initiates a request to transfer data from a disk system to the primary storage and the moment this operation is completed. It is an important metric that determines the overall performance of a computer system, especially in terms of data retrieval.
Explanation:
Disk access time is influenced by several factors, including the physical characteristics of the disk system and its components. Here are the key points to understand:
1. Disk System Components:
- Disk Drive: The hardware component responsible for reading and writing data on the disk.
- Read/Write Head: The mechanism within the disk drive that physically accesses the data on the disk.
- Disk Platter: The circular, magnetic surface where data is stored on the disk.
2. Seek Time:
- The time it takes for the read/write head to move to the correct track on the disk.
- It is influenced by the distance the head needs to travel and the speed of the head movement.
- Seek time depends on the disk drive's mechanical design.
3. Rotational Latency:
- The time it takes for the desired sector on the disk platter to rotate under the read/write head.
- It depends on the rotational speed of the disk, typically measured in revolutions per minute (RPM).
- A faster rotational speed reduces the latency.
4. Transfer Time:
- The time it takes for the data to be read from or written to the disk once the read/write head is positioned correctly.
- It is influenced by the data transfer rate of the disk and the size of the data block being transferred.
5. Total Disk Access Time:
- The sum of the seek time, rotational latency, and transfer time.
- It represents the overall time required to access the desired data on the disk.
In summary, disk access time is the interval between a computer's request for data transfer from a disk system and the completion of the operation. It encompasses the time required for the read/write head to position itself, the rotational latency for the correct sector to rotate under the head, and the transfer time for the actual data transfer. By minimizing disk access time, computer systems can improve their overall performance and responsiveness.
Explanation:
Disk access time is influenced by several factors, including the physical characteristics of the disk system and its components. Here are the key points to understand:
1. Disk System Components:
- Disk Drive: The hardware component responsible for reading and writing data on the disk.
- Read/Write Head: The mechanism within the disk drive that physically accesses the data on the disk.
- Disk Platter: The circular, magnetic surface where data is stored on the disk.
2. Seek Time:
- The time it takes for the read/write head to move to the correct track on the disk.
- It is influenced by the distance the head needs to travel and the speed of the head movement.
- Seek time depends on the disk drive's mechanical design.
3. Rotational Latency:
- The time it takes for the desired sector on the disk platter to rotate under the read/write head.
- It depends on the rotational speed of the disk, typically measured in revolutions per minute (RPM).
- A faster rotational speed reduces the latency.
4. Transfer Time:
- The time it takes for the data to be read from or written to the disk once the read/write head is positioned correctly.
- It is influenced by the data transfer rate of the disk and the size of the data block being transferred.
5. Total Disk Access Time:
- The sum of the seek time, rotational latency, and transfer time.
- It represents the overall time required to access the desired data on the disk.
In summary, disk access time is the interval between a computer's request for data transfer from a disk system and the completion of the operation. It encompasses the time required for the read/write head to position itself, the rotational latency for the correct sector to rotate under the head, and the transfer time for the actual data transfer. By minimizing disk access time, computer systems can improve their overall performance and responsiveness.
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