Exercise 6.3 Average and minimum times for reading and writing to storage devices are common measurements used to compare devices. Using techniques from Chapter 6, calculate values related to read and write time for disks with the following characteristics.

Average Seek Time RPM Disk Transfer Rate Controller Transfer Rate

a. 11 ms 7200 34 MBytes/s 480 MBits/s

b. 9 ms 7200 30 MBytes/s 500 MBits/s 6.3.1 [10] <6.2, 6.3> Calculate the average time to read or write a 1024-byte sector for each disk listed in the table.

6.3.2 [10] <6.2, 6.3> Calculate the minimum time to read or write a 2048-byte sector for each disk listed in the table.

6.3.3 [10] <6.2, 6.3> For each disk in the table, determine the dominant factor for performance. Specifi cally, if you could make an improvement to any aspect of the disk, what would you choose? If there is no dominant factor, explain why.