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