The total time to prepare a disk drive mechanism for a block of data to be…

To read data from a disk drive, the system must first prepare the mechanism by positioning the read head over the correct data block. This preparation involves two key steps: seek time and rotational latency. Seek time is the duration required for the disk arm to move the read head to the correct track where the data resides. Rotational latency is the time it takes for the desired sector to rotate under the read head once the correct track is reached. The total preparation time is the sum of these two components, making 'latency plus seek time' the correct answer. Transmission time is excluded because it refers to the actual data transfer duration, not the setup phase.