What is non-return-to-zero method and give reason why it avoids writing data to a magnetic disk.
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What is non-return-to-zero method and give reason why it avoids writing data to a magnetic disk.
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- There are many parameters that could be used to describe disk performance; among them are: number of bits per track disk capacity (in bits) number of disk surfaces rotational speed rotational latency transfer rate tracks per surface sectors per track blocks per track sectors per block seek time speed of disk arm block-read time number of blocks Some of these parameters are independent, and others are (approximately) linearly related. That is, doubling one doubles the other. Decide which of these parameters are linearly related. Then, select from the list below, the relationship that is true, to within a close approximation. Note: none of the statements may be true exactly, but one will always be much closer to the truth than the other three. Also note: you should assume all dimensions and parameters of the disk are unchanged except for the ones mentioned. a) If you divide tracks into half as many blocks, then you double the read time for a block.…There are many parameters that could be used to describe disk performance; among them are: number of bits per track disk capacity (in bits) number of disk surfaces rotational speed rotational latency transfer rate tracks per surface sectors per track blocks per track sectors per block seek time speed of disk arm block-read time number of blocks Some of these parameters are independent, and others are (approximately) linearly related. That is, doubling one doubles the other. Decide which of these parameters are linearly related. Then, select from the list below, the relationship that is true, to within a close approximation. Note: none of the statements may be true exactly, but one will always be much closer to the truth than the other three. Also note: you should assume all dimensions and parameters of the disk are unchanged except for the ones mentioned. a) If you double the number of sectors per block, then you double the number of blocks on the disk. b)…The initial sector of a disk that has been soft-sectored is indexed so that its location may be easily determined. Explain?
- Some data structures only make use of the outside tracks of magnetic disks, while others completely ignore the inner tracks. The phrase "hot spots" is often used to refer to such arrangements. Why would you want to do that, exactly?When it comes to storage, there are pros and downsides to each method.Give examples of the advantages of pickling objects for file storage.
- You have a disk with an average seek time of 3ms. Its rotation speed is 20,000rpm. The disk is organized as 512-byte sectors with 500 sectors per track. Assume that the disk uses sequential organization. How long would it take to read a file consisting of 3000 sectors? What is the total size of the file read in MB?To what extent does disk write caching benefit from the following?To what end do files on a disk get scattered over its many surfaces?
- On disk, operating systems endeavor to store files in sequentially arranged blocks. The usage of magnetic disks appears superfluous for this operation.Do you suppose SSDs are required if you do not use them? Exists a justification for this occurrence?Consider a disk pack with 32 surfaces, 64 tracks and 512 sectors per pack. 256 bytes of data are stored in a bit serial manner in a sector. The number of bits required to specify a particular sector in the disk is.What causes diskthrashing in the first place? What actions may be taken to lessen its effects?