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.

Hard drive with windows 7 preinstalled