Draw a circle representing one platter surface of a hard disk. On your drawing show an example of a track, of a sector, and of a block. 10.5 Draw a sector representing one platter surface of a hard disk with sixteen sectors. On your drawing show a track, the sectors, and a single block. Place a magnetic head somewhere on your drawing. Show on your drawing the seek time, latency time, and read time for the block that you drew on the disk. 10.6 Suppose a disk is rotating at 7200 rpm. What is the minimum latency time for this disk? What is the maximum latency time for this disk? 10.7 What is a disk array? What advantages does a disk array offer over those of a single disk?

 

 

Silicon Dynamics has developed a new computer chip that will enable it to begin producing and marketing a personal computer if it so desires. Alternatively, it can sell the rights to the computer chip for $15 million. If the company chooses to build computers, the profitability of the venture depends upon the company's ability to market the computer during the first year. It has sufficient access to retail outlets that it can guarantee sales of 10,000 computers. On the other hand, if this computer catches on, the company can sell 100,000 machines. For analysis purposes, these two levels of sales are taken to be the two possible outcomes of marketing the computer, but it is unclear what their prior probabilities are. If the decision is to go ahead with producing and marketing the computer, the company will produce as many chips as it finds it will be able to sell, but not more. The cost of setting up the assembly line is $6 million. The difference between the selling price and the variable cost of each computer is $600. Assuming that the probability of high sales is 0.6 and probability of low sales is 0.4, determine an optimal decision using the minimax, maximum likelihood, and expected value criterion.