Formatting a drive involves erasing all the data on the drive and preparing it for use by setting up a file system. When Drive C is formatted, the operating system, programs, and all personal files stored on it are permanently deleted. This action cannot be undone without a backup of the data, making it a critical decision.
When asked "Which type of installation do you want?", choose Custom: Install Windows only (advanced) . format drive c
How to Format Drive C: A Complete Guide to Wiping Your Primary Partition Formatting a drive involves erasing all the data