C drive is full. How can I extend C drive without losing data on Windows 10 PC?

Dylanopen The recommended C drive size for Windows 10 is at least 100–120 GB to ensure smooth system performance. With this storage range, you won't have c drive full issue in Windows 10 and no need to increase C drive size. This size accommodates the operating system, essential system files, updates, and a few applications.

Here’s a more detailed breakdown based on usage:

Basic Usage (OS and essential programs only): 100-120 GB is generally sufficient, covering Windows 10 itself (around 20-30 GB) and leaving room for updates and system files.

Moderate Usage (OS, essential programs, and common applications): 150-200 GB is ideal if you install programs like Office, browsers, and light editing software.

Heavy Usage (OS, large applications, and some games): 250+ GB is recommended if you install larger programs (like Adobe Creative Suite) or store games, which can consume significant space.

Allocating a larger C drive also helps avoid running out of space for updates and improves overall performance, as Windows requires extra space for virtual memory and temporary files.