Figure 7-1 While the computer is running, the platters in a hard disk (such as that shown in Figure 7-1) usually rotate at ____, which allows nearly instant access to all tracks and sectors.
A) 54 to 150 revolutions per minute (rpm)
B) 5,400 to 15,000 revolutions per second (rps)
C) 54 to 150 revolutions per hour (rph)
D) 5,400 to 15,000 revolutions per minute (rpm)

Question

Figure 7-1 While the computer is running, the platters in a hard disk (such as that shown in Figure 7-1) usually rotate at ____, which allows nearly instant access to all tracks and sectors.
A) 54 to 150 revolutions per minute (rpm) 
B) 5,400 to 15,000 revolutions per second (rps) 
C) 54 to 150 revolutions per hour (rph) 
D) 5,400 to 15,000 revolutions per minute (rpm)

Quizplus · Accepted Answer

The platters in a hard disk usually rotate at a high speed measured in revolutions per minute (rpm) while the computer is running. The options A and C are not practical as the rotation speed is too slow, and option B is not a common unit for measuring disk platter rotation speed. Therefore, option D, which ranges from 5,400 to 15,000 rpm, is the best choice.

Figure 7-1 While the Computer Is Running, the Platters in a Hard