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Unformatted text preview: EECS 484 – Homework #3 Question 1 What does each of the following terms mean? Feel free to draw a picture. (a) Platter (b) Sector (c) Track (d) Cylinder (e) Disk Head What does it mean to lay the pages of a file out “sequentially on disk”? It is important to lay the pages of a file out sequentially on disk in order to minimize the cost of I/O. In terms of the geometry of a modern disk, this generally means allocating sequential blocks (combinations of sectors) on the same track, then blocks on the same cylinder, and then blocks on adjacent cylinders. Briefly explain the difference between a random and a sequential I/O in terms of what the disk must do for each. In general, when performing a random I/O, the disk must (1) Move the disk head to the appropriate track (seek time), and (2) Wait for the disk to spin around the appropriate sector / block (rotational delay) before reading the data from the disk....
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This note was uploaded on 12/08/2011 for the course EECS 484 taught by Professor Staff during the Winter '08 term at University of Michigan.
- Winter '08