What does reformatting my hard disk do?

Reformatting refers to formatting a hard disk or partition that already has been formatted or that contains data. Reformatting a disk deletes all data on the disk.

In some older versions of Windows, reformatting a hard disk and then reinstalling Windows was sometimes recommended as a method for fixing a serious computer problem. Reformatting would fix the problem at the expense of deleting everything on the computer. You would then have to reinstall your programs by using the original installation files or discs, and then restore all of your personal files, such as documents, music, and pictures, from backups that you had made beforehand.

This version of Windows offers a number of recovery options that are less drastic and provide a better place to start fixing your computer problems. For more information, search Windows Help and Support for "recovery options." Reformatting and reinstalling should be considered as a last resort that's only performed after all other recovery or diagnostic options have failed.