Hello... It like telling something or someone to kill it's self... the OS has built in safe guards and Thus you need to do it outside of the OS. B / Disk management is great for creating but not for destroying previous OS installs... if it was just a DATA drive Yes... but even then the OS can put hidden files on it that will never be removed... such as Temp, Pagefile.sys or hibernation storage areas. If you don't remove these too, you will never get full access of the drive or cause other disk accessing problems. And that's what you encountered B D
In a computer shop they have pre-made USB2 bootable drive utilities to do this fast with... I at home just use any Windows install media when I need to do this.
And since you have "pre-installed OS" you may not have install/recovery media made for your personal use or protection B / I suggest you look into making these items, as the day your OS/drive crashes... you will be looking for these items, and you won't have them. B )