Which component comes in two varieties—one that mechanically writes binary data onto spinning magnetic disks and one that writes data with no mechanical parts?

The motherboard is the main circuit board of a computer that connects all components, including the CPU, memory, and storage devices. However, the motherboard itself does not have the functionality to directly write data onto spinning magnetic disks or solid-state drives; this task is typically handled by specific storage devices like hard drives or SSDs.

The system clock is responsible for keeping time in a computer system and synchronizing various operations. It does not directly involve the writing of data onto storage devices, whether they are traditional HDDs or modern SSDs.

Expansion buses are pathways on the motherboard that allow for the connection of additional hardware components, such as graphics cards, network cards, and storage devices. While expansion buses facilitate communication between components, they do not perform the mechanical writing of binary data onto spinning magnetic disks or solid-state drives.