Reset laptop without cds etc?

I have a toshiba laptop, (win8) would like to reset the factory settings, because I want to give him and does not want him to have data from me.

've just read that you can reset a cd o.ä. Needs.

I bought the laptop myself and there was nothing there except the laptop itself.

is there a possibility to delete all data on it? (Default)

https://support.microsoft.com/...h-reset-pc

Factory setting does not mean that all data is deleted. To do this you have to use the hard disk with a data deletion program such as. Overwrite Erazer.

Just delete it from Windows does not destroy the data. This just deletes WinPoints, so they are no longer visible