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Calculate the total time required to read 35 sectors on a 2-sided floppy disk. Assume that each track has 8 sectors and the track-to-track step time is 8 milliseconds. The first sector to be read is sector 3 on track 10. Assume that the diskette is soft sectored and the controller has a 1-sector buffer. The diskette spins at 300 RPM and initially, the head is on track 10.
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Given: The diskette spins at 300 RPM

Time to read 1 track =1/300 minute

=60/300 seconds 

=1/5 seconds

Time to read one sector =(1/8)*(1/5)=1/40 seconds

now given that 35 sectors and started from the sector 3 on track 10th

so the distribution of sector which we have to read  is  6,8,8,8,5 

which means first we read 6 sectors of 10th track 

after that, we will read 8 sectors of 11th track 

after that, we will read 8 sectors of 12th track

after that, we will read 8 sectors of 13th track

after that, we will read 5 sectors of 14th track

Given: the track-to-track step time is 8 milliseconds

we have to read the data from the 5 track (that is 6,8,8,8,5). we have to change the track 4 times.

therefore the total time to move from one track to another for these five-track =4*8 milliseconds=32ms

and total time to read 35 sectors =35*(1/40)=35/40 seconds=35000/40 ms=875 ms

so total time=875+32=907 ms 

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