2) b. A disk drive has a speed of 12000 RPM, an average seek time of...
2)
b. 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, the 50 reads are from random spots on the drive, but each individual read is performed sequentially.) Give your answer in units of seconds.
c. Given the same information as in b) above, what is the I/O rate for the 50 reads? Give your answer in MB/sec.
Homework Answers
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2)
b. A disk drive has a speed of 12000 RPM, an average seek time
of...
7. [1+1+1-3 points] Compute the (a) transfer time, (b) average rotational latency, and(c) disk access time for the following input data for a disk? Rotational speed- 7200 rpm, sector size- 0.5 KB...
7. [1+1+1-3 points] Compute the (a) transfer time, (b) average rotational latency, and(c) disk access time for the following input data for a disk? Rotational speed- 7200 rpm, sector size- 0.5 KB, average seek time 5.7 ms, transfer rate 24.5 MB per sec, controller overhead -1 ms
7. [1+1+1-3 points] Compute the (a) transfer time, (b) average rotational latency, and(c) disk access time for the following input data for a disk? Rotational speed- 7200 rpm, sector size- 0.5 KB, average...
A given disk drive has the following parameters: Average seek time of 7 ms Rotates at...
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What is the average I/O time if a 3600-RPM disk transfers an 800 KB block with a 7 ms average see...
What is the average I/O time if a 3600-RPM disk transfers an 800 KB block with a 7 ms average seek time, a 100 MB/sec transfer rate, and a 0.17 ms controller overhead?
Suppose a disk drive in your system has a rotation speed of 7,200 rpm. and seek...
Suppose a disk drive in your system has a rotation speed of 7,200 rpm. and seek times of 0.75 ms track-to-track, or 22 ms full ‘stroke’ (inner edge to outer edge). (a) What is the average latency to access this drive? (b) If the sustained read rate is 36 Mbits/sec, how much more time after the average latency (you calculated above) will it take to read 750 Kbytes (assuming all those bytes are in sequential sectors on the same track)?...
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A hard disk has average seek time of 70 ms, rotation speed of 4150 rpm, and 333 byte sectors with 55 sectors per track. We need to read a file consisting 130 sectors. Answer the following? Total average access time can be expressed as T a = T s+1/(2r)+b/rN ̈ What is the total file size to be transferred? ̈ What is the total time for the transfer if data is organized sequentially? ̈ What is the total time for...
A given disk drive has the following parameters: Average seek time of 7 ms Rotates at 6000 RPM Transfers data at 100 MB/s What is the average amount of time it takes to read one sector (512 bytes) o...
A given disk drive has the following parameters: Average seek time of 7 ms Rotates at 6000 RPM Transfers data at 100 MB/s What is the average amount of time it takes to read one sector (512 bytes) of data? Your answer should be in seconds to three digits of precision (e.g., X.XXX s).
Suppose we have a magnetic disk with the following parameters : • Average seek time =...
Suppose we have a magnetic disk with the following parameters : • Average seek time = 6 ms • Rotation rate = 5400 RPM • Transfer rate = 100 MB/second • Sector size = 512 bytes What is the average time to read a single sector?
A program must write 4 sectors onto a disk. Each sector is 0.5KB. The disk drive...
A program must write 4 sectors onto a disk. Each sector is 0.5KB. The disk drive rotates at 10,000 rpm. The average seek time is 6 ms and the disk controller overhead is 1 ms. The transfer rate is 1 MB/sec. The current location of the R/W head is not known. What is the time to write this data if a. Sectors are on the same track and are contiguous b. Sectors are on the adjacent cylinders. The sectors can...
bæ4 The Average I/O time for transferring a 8KB block on a 15000 RPM disk with...
bæ4 The Average I/O time for transferring a 8KB block on a 15000 RPM disk with a 5ms average seek time, 1Gb/sec transfer rate with a 0.1 ms controller overhead is 6.172 ms O 9.301 ms O 8.206 ms O 7.161 ms
A hard disk has average seek time 9ms, 7200 revolutions per minute, disk transfer rate of...
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7. [1+1+1-3 points] Compute the (a) transfer time, (b) average rotational latency, and(c) disk access time for the following input data for a disk? Rotational speed- 7200 rpm, sector size- 0.5 KB, average seek time 5.7 ms, transfer rate 24.5 MB per sec, controller overhead -1 ms
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A program must write 4 sectors onto a disk. Each sector is 0.5KB. The disk drive rotates at 10,000 rpm. The average seek time is 6 ms and the disk controller overhead is 1 ms. The transfer rate is 1 MB/sec. The current location of the R/W head is not known. What is the time to write this data if a. Sectors are on the same track and are contiguous b. Sectors are on the adjacent cylinders. The sectors can...
bæ4 The Average I/O time for transferring a 8KB block on a 15000 RPM disk with a 5ms average seek time, 1Gb/sec transfer rate with a 0.1 ms controller overhead is 6.172 ms O 9.301 ms O 8.206 ms O 7.161 ms
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