What Is a Computer Drive? Understanding C Drive, D Drive, Why There’s No A or B, and the Difference Between System Drives and Storage Devices | Funifytools

In Windows, storage devices (HDD/SSD) appear as lettered drives that act like big drawers for your data.

The C: drive is the system’s heart, typically housing Windows and most installed apps.

A D: drive often serves as secondary storage (separate partition or disk) for personal files, easing reinstalls.

Letters start at C: because A: and B: were historically floppy drives; USB letters can be reassigned—never change C:.

Drives can also be virtual or cloud-backed (ISO mounts, OneDrive), so a “drive” is an addressing concept, not just hardware.




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