The average time necessary for the correct sector of a disk to arrive at the read write head is Rotational delay Explain?
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Q: Problem: Consider a long sequence of accesses to a disk with an average seek time of 6 ms and an…
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Q: acks per surface 256 sectors per track 512 bytes/sector Track-to-tr
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Q: Suppose a disk drive has the following characteristics: -6 surfaces -16,383 tracks per surface…
A: Given : Suppose a disk drive has the following characteristics: -6 surfaces -16,383 tracks per…
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A: Here, I have to provide a solution to the above question.
Q: Suppose a disk drive has the following characteristics:1. Five surfaces2. 1,024 tracks per surface3.…
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Q: Suppose that a magnetic disk has an average seek time of 4 ms, a rotation rate of 5400 RPM, a…
A: Your question is about finding avg. Amount of time to read a single sector Let's see the solution…
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Q: question(6).Consider a disk pack with 32 surfaces, 64 tracks and 512 sectors per pack. 256 bytes of…
A: Introduction :
Q: There is sequence of disk track requests:75 62 99 144 50 162 110 26 198. #Assume that the disk…
A: Given: The sequence of track=75 62 99 144 50 162 110 26 198. Initial position of track=100 Solution…
The average time necessary for the correct sector of a disk to arrive at the read write head is Rotational delay Explain?
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- What is the average time to read or write a 512-byte sector for a typical disk rotating at 45,000 RPM? The advertised average seek time is 2 ms, the transfer rate is 400 MB/sec, and the controller overhead is 0.2 ms. Assume that the disk is idle so that there is no waiting time.Suppose that a disk drive rotates at 8000 RPM. It has an average seek time of 4 milliseconds. If its transfer rate is 15 Mbps, determine the average time it takes for a 15K byte request to be transferred from the time the disk starts the seek? From this, determine its throughput.What is the average time to read or write a 512 bytes sector for a disk? The advertised average seek time is 5 ms, the transfer rate is 40 MB/sec, it rotates at 10,000 RPM, and the controller overhead is 0.1 ms. Assume the disk is idle so that there is no queuing delay. In addition, calculate the time assuming the advertised seek time is three times longer than the measured seek time.
- The disk specification in Figure 7.15 gives a data transfer rate of 60MB per second when reading from the disk, and 320MB per second when writing to the disk. Why are these numbers different? (Hint: Think about buffering.)Calculate the access time for a disk having the size of 512 byte/sector and the seek time of 12ms. The rotational rate is 5700 RPM. The data transfer rate is 3MB/sec, and the the controller overhead is 1ms, you may even assume that there is no service time for the access.Suppose that a magnetic disk has an average seek time of 4 ms, a rotation rate of 5400 RPM, a transfer rate of 50 MB/second, a sector size of 512 bytes, and controller overhead of 2 ms. What is the average amount of time to read a single sector?
- Compare the bit-map and hole-list methods for keeping track of free space on a disk with 800 cylinders, each one having 5 tracks of 32 sectors. How many holes would it take before the hole list would be larger than the bit map? Assume that the allocation unit is the sector and that a hole requires a 32-bit table entry.There is sequence of disk track requests: 75, 62, 99, 144, 50, 162, 110, 26, 198. Assume that the disk head is initially positioned over track 100, and is moving in the direction of decreasing track number. For SCAN algorithm A)What is the tracking order? B) What is Average Track Length?In Feynman's lecture he wondered "why cannot we write the entire 24 volumes of the Encyclopedia Brittanica on the head of a pin". For a modern hard disk drive the area of a single bit of information on the surface of the disk is roughly 10 x 40 nm² in area. In such a hard drive would the area required to store the data for 24 volumes of the Encyclopedia Brittanica be greater or less than the head of a pin? In Feynman's lecture he estimates the 24 million books as big as the Encyclopedia Brittanica has 10¹5 bits of information.
- Consider a single-platter disk with the following parameters: rotation speed: 7200 rpm; number of tracks on one side of platter: 30,000; number of sectors per track: 600; seek time: one ms for every hundred tracks traversed. Let the disk receive a request to access a random sector on a random track and assume the disk head starts at track 0. a. What is the average seek time? b. What is the rotational latency? c. What is the transfer time for a sector? d. What is the total average time to satisfy a request?Consider the disk which has average seek time of 32 ns and rotational rate of 360 rpm(round per minute), Each track of the disk has 512 sectors, each of size 512 bytes. What is the time taken to read four continuous sectors? And What is the data transfer rate?Transfer rate of a disk drive can be no faster than the bit density (bits/track) times the rotational speed of the disk. Figure 7.15 gives a data transfer rate of 112GB/sec. Assume that the average track length of the disk is 5.5 inches. What is the average bit density of the disk?