Question

Match List-I with List-II:
\[\begin{array}{|c|c|}\hline \textbf{List-I} & \textbf{List-II} \\ \hline (A)\ \text{Seek Time} & (IV)\ \text{Time taken for the disk arm to move the heads to the cylinder containing the desired sector} \\ \hline (B)\ \text{Access Time} & (III)\ \text{Seek Time + Rotational Latency} \\ \hline (C)\ \text{Rotational Latency} & (II)\ \text{Time taken for the disk to rotate the desired sector to the disk head} \\ \hline (D)\ \text{Disk Bandwidth} & (I)\ \text{Total number of bytes transferred, divided by the total time between the first request for service and the completion of the last transfer} \\ \hline \end{array}\] Choose the correct answer from the options given below:

• (A) - (I), (B) - (II), (C) - (III), (D) - (IV)
• (A) - (III), (B) - (II), (C) - (IV), (D) - (I)
• (A) - (I), (B) - (III), (C) - (IV), (D) - (II)
• (A) - (IV), (B) - (III), (C) - (II), (D) - (I)

Hint:

The disk access time is the sum of seek time and rotational latency, while bandwidth measures how quickly data can be read or written.

Answer 1

The Correct Option is A

Step 1: Definition of Terms.
- **Seek Time** (A): Time taken by the disk arm to move to the desired cylinder.
- **Access Time** (B): The total time taken to access a disk sector, including both seek time and rotational latency.
- **Rotational Latency** (C): The time taken for the disk to rotate and align the desired sector under the disk head.
- **Disk Bandwidth** (D): The rate at which data can be read or written from/to the disk.

Step 2: Match each term with the corresponding feature.
- **Seek Time** corresponds to **(IV)**, which is the time taken for the disk arm to move to the required cylinder. - **Access Time** corresponds to **(III)**, which is the sum of seek time and rotational latency. - **Rotational Latency** corresponds to **(II)**, which is the time for the disk to rotate the desired sector under the head. - **Disk Bandwidth** corresponds to **(I)**, which refers to the rate of transfer of data.

Step 3: Conclusion.
The correct matching is **(A) - (I), (B) - (II), (C) - (III), (D) - (IV)**.