Dale - Computer Science Illuminated 398

Dale - Computer Science Illuminated 398 - How are these...

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Thought Questions 371 Use the following list of cylinder requests in Exercises 31 through 33. They are listed in the order in which they were received. 40, 12, 22, 66, 67, 33, 80 31. List the order in which these requests are handled if the FCFS algo- rithm is used. Assume that the disk is positioned at cylinder 50. 32. List the order in which these requests are handled if the SSTF algo- rithm is used. Assume that the disk is positioned at cylinder 50. 33. List the order in which these requests are handled if the SCAN algo- rithm is used. Assume that the disk is positioned at cylinder 50 and the read/write heads are moving toward the higher cylinder numbers. 34. Explain the concept of starvation. Thought Questions 1. The concept of a file permeates computing. Would the computer be useful if there were no secondary memory on which to store files? 2. The disk-scheduling algorithms examined in this chapter sound familiar. In what other context have we discussed similar algorithms?
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Unformatted text preview: How are these similar and how are the different? 3. Are there any analogies between files and directories and file folders and filing cabinets? Clearly the name file came from this concept. Where does this analogy hold true and where does it not? 4. Both viruses and denial of services can cause great inconvenience at the least and usually serious monetary damage. How are these problems similar and how are they different. Is one more serious than the other? 5. Have you ever been affected by a virus attack? How much time and/or data did you lose? Do you have a firewall installed in your computer system? 6. Have you ever tried to reach a Web site that was under attack? How many times did you try to access the site? 7. How many times have you seen an article in the paper or on the news about either a DoS or virus in the last week? Month? Year? ?...
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