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- 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.A disk drive has 1000 cylinders, 8 tracks per cylinder, 32 sectors per track, and 512 bytes per sector. The rotation time is 4ms. The read/write head takes 10ms to move between adjacent cylinders. A data file contains 200KB of data stored consecutively. What is the maximum seek time if the average time needed to read the data is 170ms?Consider a disk with 2 MB/track, a rotation time of 10 msec, average seek time of 5 msec. On average, how long it takes to read 500 bytes from the disk?
- 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?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.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?
- 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?The outer track 0 of a hard disk has a diameter of 8cm, the innermost track 36113 has a diameter of 4cm. For simplicity, let's assume that the head is moving at a constant speed of 2m/s. The hard disk rotates at 7200 rpm, the reading time of the sectors is negligible. How long does it take to change lanes from lane 0 to lane 36113? Enter the answer in milliseconds without decimal places.A certain moving arm disk storage, with one head, has the following specifications. Number of tracks/recording surface = 200 Disk rotation speed = 2400 rpm Track storage capacity = 62,500 bits The average latency of this device is P msec and the data transfer rate is Q bits/sec. Write the value of P and Q.
- 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?A certain disk can read data at a rate of 515.2 MB/s. How many books can be read in 4 seconds if an "average" book has69 pages,20 lines per page,9 words per line,6 characters per word,and each character is one of 100 different characters where the fewest number of bits are used to represent each character?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 average rotational latency? c. What is the transfer time for a sector?