Why do you think the term random access device is something of a misnomer for disk drives? Why do differing systems place disk directories in different track locations on the disk? What are the...

Why do you think the term random access device is something of a misnomer for disk drives? Why do differing systems place disk directories in different track locations on the disk? What are the advantages of using each location that you cited? Do you trust disk drive MTTF figures? Explain.