Kristen wants to view the records of her database in ascending order. What should she do?
2 answers:
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Answer:
a)
b)
d)
e)
And if we convert using 1 s = 1000 ms we have"
The block transfer time btt would be given by:
And the average rotational delay would be given by:
f) For this case we can calculate the average time to locate and transfer adding the following time:
g) For this case we can calculate the time to transfer 20 random blocks like this:
And the time to transfer 20 consecutive blocks using double buffering would be:
Explanation:
Part a
For this case we need to calculate first the total capcity like this:
Where N represent the number of blocs per track, and if we replace we got:
And the useful capacity is given by:
Part b
For this case the number of cylinders correspond to the number of tracks.
Part c
First we can calculate the total cylinder capacity like this:
And the useful capacity is:
Part d
We can calculate the totals like on part d but we just need to multiply by 400 since that represent the number of tracks per surface
Part e
For this case we can convert the revolution per minute in revolutions per second like this:
And we can calculate the transfer rate like this:
And if we convert using 1 s = 1000 ms we have"
The block transfer time btt would be given by:
And the average rotational delay would be given by:
Part f
For this case we can calculate the average time to locate and transfer adding the following time:
Part g
For this case we can calculate the time to transfer 20 random blocks like this:
And the time to transfer 20 consecutive blocks using double buffering would be: