Disk Technology

question 17

Essay

Disk Technology. Suppose we have a magnetic disk (resembling an IBM Microdrive) with the following parameters:
Answer the following questions. (Note: you may leave any answer as a fraction.)
(a) What is the average time to read a single sector?
(b) What is the average time to read 8 KB in 16 consecutive sectors in the same cylinder?
(c) Now suppose we have an array of 4 of these disks. They are all synchronized such that the arms on all the disks are always on the same sector within the track. The data is striped across the 4 disks so that 4 logically consecutive sectors can be read in parallel. What is the average time to read 32 consecutive KB from the disk array?

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Definitions:

Teratogens

Agents, such as chemicals or viruses, that can cause developmental malformations or defects in an embryo or fetus.

Sensitive Periods

Specific times during early development when the brain is particularly receptive to learning certain skills or knowledge.

Genetic Susceptibility

The increased likelihood of developing a particular disease based on a person's genetic makeup.

Motor Development

Refers to the progression of muscle coordination, strength, and the ability to move and control physical actions.