Open File Explorer by double-clicking This PC icon from desktop and right-click C drive and choose Format option. On Windows computer, you can format any partition except system partition in File Explorer or Disk Management when operating system is running. In this case, you can format C partition with the system setup installer during reinstalling. Reinstall OS: You need to format system partition before reinstalling it or changing Windows version.System has crashed: Operating system on your computer cannot boot, and formatting C drive and reinstalling system might be ultimate solution.Formatting C drive can wipe virus or malware safely and safeguard computer. Remove virus and malware: Operating system infects virus or malware is dangerous to personal data, as files might be damaged, lost or even leaked to third-party.Erase data: It is advised to wipe hard drive before recycling or donating it, as the drive might contain sensitive data.Upgrade system disk: Windows is installed on an SSD which is running out of free space and you plan to upgrade the disk to a larger one.Retire computer: When you want to replace your computer with a new one, you might need to format computer to erase data before selling or giving away in the view of data security.Why do users still want to format C drive? The reasons for formatting system partition vary from one to another and here are some common reasons: Bonus Tip: Formatted partition data recoveryĬ drive is usually system partition on most computers, and formatting C drive gives the chance that computer loses operating system and cannot boot.Method #3: Format C drive using DiskGenius Free edition.Method #2: Format C drive /system partition via system repair disc.Method #1: Format C drive with Windows Setup Disc.

Disk format for windows