The Megatron 777 disk has the following characteristics 1 Th

The Megatron 777 disk has the following characteristics:

1. There are ten surfaces, with 100,000 tracks each.

2. Tracks hold an average of 1000 sectors of 1024 btyes each.

3. 20% of each track is used for gaps.

4. The disk rotates at 10,000 rpm.

5. The time it takes the head to move n tracks is 1 + 0.0002n milliseconds.

Answer the following questions about the Megatron 777.

a) What is the capacity of the disk?

b) If tracks are locatd on the outer inch of a 3.5-inch-diamter surface, what is the average density of bits in the sectors of a track?

c) What is the maximum seek time?

d) What is the maximum rotational latency?

e) If a block is 65,546 bytes (i.e., 64 sectors), what is the transfer time of a block?

f) What is the average seek time?

g) What is the average rotational latency?

a) The disk has 10 * 10, 0000 = 100, 0000 tracks. . Thus, the capacity is 100, 0000 *1000*1024

b) Substitute 10,000 for n in the formula (1 + 0.0002n) = 1+ 2/10000*1000000 = 21ms

c) Since the disk rotates at 10,000 rpm, it takes 60/10000 of minute or 6 milliseconds.

d) 64 sectors with 63 gaps and 1000 sector with 1000 gap

Degrees = (64/1000 *10% + 63/1000 * 90%). * 360 = 23.004 degree

Time =. 23.004/360 * 10% = 63.9 ms

e) The average seeks time. = 1 + 0.0002 * (100000/2) = 11 ms

f) Average rotational delay = max rotational latency /2 = 5ms