Compress C Drive ((top)) Jun 2026

If you still need space after that, then compress only specific folders (e.g., C:\ProgramData\SomeOldApp ), not the entire system drive. Your future self, waiting for your PC to boot, will thank you.

To check if your system is already compressed, type: compact /compactos:query To begin compression, type: compact /compactos:always 3. Pros and Cons of Compressing Your C Drive compress c drive