Notes: There are 1000 milliseconds in a second. RPM means "revolutions per minute". "ms" stands for "milliseconds". 1. T

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Notes There Are 1000 Milliseconds In A Second Rpm Means Revolutions Per Minute Ms Stands For Milliseconds 1 T 1 (447.05 KiB) Viewed 69 times

Notes: There are 1000 milliseconds in a second. RPM means "revolutions per minute". "ms" stands for "milliseconds". 1. The OS controls an I/O device by a. sending a message to the device's port b. using CPU instructions specific to that device c. writing to registers in the device's controller. 2. Common hard drives speeds are 5400 RPM and 7200 RPM. What would be the average rotational delay of a hard drive with a speed of 9000 RPM? 3. What is the average access time for a hard drive for an average seek time of 3.5 ms and a speed of 5400 RPM? 4. A hard disk drive has an average access time of 10 ms and a transfer rate of 120 MB/sec. How long will it take to read 40 MB of data from the drive, assuming a sequential workload? 5. A disk drive has a speed of 12000 RPM, an average seek time of 5 ms, and a transfer rate of 140 MB/sec. How much time does it take to perform 50 random reads of 10 KB? (In other words, a random workload.) Give your answer in units of seconds. 6. Given the same information as in the previous problem, what is the I/O rate for the 50 reads? Give your answer in MB/sec. 7. My hard drive took 1.46 seconds to read a file. Assume the read was sequential, that my drive's transfer rate is 110 MB/sec, and that my drive's average access time is 8 ms. How much data was read? Give your answer in MB.