Why Windows Users Favor C/D Drives Over the HOME Directory

In Windows, the environment variable %USERPROFILE% points to the user's home folder (e.g., C:\users\tom), which is equivalent to the $HOME directory on Linux ( /home/tom).

The preference for C/D drives stems from Windows' ancestry in DOS. DOS was a single‑user, command‑line system without a user concept and introduced drive letters C, D, E for hard‑disk partitions, while A and B were reserved for floppy disks that later disappeared.

When Microsoft transitioned DOS to a graphical interface, it retained the drive‑letter scheme for compatibility. Consequently, generations of users learned to associate file storage with specific drive letters rather than a unified home folder.

Many Windows users still create separate partitions—C for the system, D for software, and E for data—because this organization makes the purpose of each folder immediately clear. Older Windows versions were less stable; a system failure often required reinstalling Windows and reformatting the C drive, which could erase all data if everything was stored there. Distributing data across multiple drives reduces the risk of total loss.

Although Windows 10 is far more stable and such reinstall scenarios are rare, the habit of partition‑based organization persists among users.