Formatting of Hard Disk is big problem of the person who want to secure hard disk data for future use and other people also facing many types of problem .So, here is some tips on formatting disk.
1.Make sure your data is backup to the other storing device.
2.If you’re running on the windows platform then make sure you have serial key which require in reinstalling the windows in your system.
3.If you want to format only C:/ then delete C:/ other will safe No data loss happen from other drive.
4.Make sure your bootable pendrive/cd have all the configuration and is ready to boot your system.
if other queries on your then feel free to ask me on comment section or directly msg me.