If a machine guard is missing or needs repair, you should _____________

Consider a magnetic disk consisting of 16 heads and 400 cylinders. This disk has four 100-cylinder zones with the cylinders in d

e-lub [12.9K]

Answer:

Disk Capacity = 45056000 bytes

Optimal skew = 26.455 ≈ 27

Maximum Data transfer rate = 262.5 GB per second

Explanation:

given data

heads = 16

cylinders = 400

cylinder zones = 100

each sector contains = 512 bytes

average seek time = 1 msec

disk rotates = 7200 RPM

to find out

disk capacity, optimal track skew, and maximum data transfer rate

solution

first we get total number of sectors that is

total number of sector = number of zones × (number of sectors in different zones

total number of sector = 100 × (160+200+240+280)

total number of sector = 88000

so

Disk Capacity = total number of sectors × size of each sector

Disk Capacity = 88000 × 512

Disk Capacity = 45056000 bytes

and

Rotation time = $\frac{60}{7200}$

Rotation time = 8.33 milli seconds

so Optimal number of sectors in a track = average of ( 160,200,240,280 )

Optimal number of sectors in a track = 220

now New sector is read every $\frac{8.33}{220}$ i.e = 0.0378 ms

here Optimal skew = seek time ÷ new sector read time

Optimal skew = $\frac{1}{0.0378}$

Optimal skew = 26.455 ≈ 27

and

here we know that for maximum transfer rate we will select cylinder with maximum number of sectors i.e here 280 sectors

so

capacity of one track with maximum = 280 × 512

capacity of one track with maximum = = 143360 bytes

and Number of rotations in 1 second is = $\frac{7200}{60}$

Number of rotations in 1 second is = 120

so Data transfer rate = Number of heads × Capacity of one track × Number of rotations in one second

Data transfer rate = 16 × 143360 × 120

Data transfer rate = 275251200 bytes per second

Data transfer rate = 262.5 GB per second

3 0

3 years ago

F a black car and a white car are left in the Sun, the black car will tend to be hotter. This is because the black car's surface

AysviL [449]

Answer:

Absorb

Explanation:

Compared to a white car, a black car is a black object that absorbs light and all colors without reflecting any compared to white. When black objects absorbs all the energy from colors around them they would then become hot, the objects would then release some of this heat energy into the air. So in a nutshell, the black car absorbs all the light that would hit it and then it would convert it to heat

3 0

3 years ago

Read 2 more answers

Una frase de: ama la vida quien___________________________________

TEA [102]

Answer:

A phrase from: who loves life

Explanation:

5 0

3 years ago

You are the project manager assigned to construct a new 10-story office building. You are trying to estimate the costs for this

Semmy [17]

Answer:

Bottom-up Estimation

Explanation:

Bottom-up estimation is a type of project cost estimation that considers the cost of individual project activities and finally sums them up or finds the aggregates. The summation gives an idea of what the entire project will cost.

This is an effective way of estimating the cost of a project as it evaluates the costs on a wholistic basis. It also considers the tiniest details during the estimation process. The process moves from the simpler details to the more complicated details.

8 0

3 years ago

Calculate the unit length of a roof using common rafters if the unit run is 7 inches. Round your answer to two decimal places.

elena-14-01-66 [18.8K]

Answer:

Explanation:

https://www.pole-barn.info/roof-rafter-calculations.html

4 0

3 years ago

If a machine guard is missing or needs repair, you should ______________.