When a disk has been soft-sectored, an index is written to the disk to show where the first sector is located. Explain?

For the purpose of simplicity, let's say that a file block is located at the disc address 581132. What do you think about the information offered here?

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.…

Give some specific instances of the benefits as well as the drawbacks associated with caching disc write operations.