Which component is primarily responsible for rotating the disk platter in a hard disk drive?

Which component is primarily responsible for rotating the disk platter in a hard disk drive?

• A. Spindle
• B. Read/Write Arm
• C. Actuator
• D. Control Circuit Board

Answer: (A)

The essential idea is identifying what provides the spinning motion for the disk surfaces. The platters are mounted on the spindle and turned by the spindle motor, which drives them at a constant speed so data can be read or written as the surfaces rotate beneath the heads. The read/write arm and the actuator move the heads to the right position across the disk, but they do not rotate the platters. The control circuit board handles signaling and control tasks, not the mechanical rotation. So the component that primarily rotates the disk platter is the spindle (spindle motor).

The essential idea is identifying what provides the spinning motion for the disk surfaces. The platters are mounted on the spindle and turned by the spindle motor, which drives them at a constant speed so data can be read or written as the surfaces rotate beneath the heads. The read/write arm and the actuator move the heads to the right position across the disk, but they do not rotate the platters. The control circuit board handles signaling and control tasks, not the mechanical rotation. So the component that primarily rotates the disk platter is the spindle (spindle motor).