If you think that formatting and deleting data on your computer and laptop would clean your drive, think again. These actions make no guarantee to clean and erase your drive. Delete is not really a word that indicates its meaning. Because they are still there and you need a wipe drive to make sure that everything you deleted no longer exists. If you happen to sell or discard your old computer, make sure that you only sell the computer and not the private data and documents that are still stored in your PC.
It is like giving away your information easily to a thief and be surprised one day when everything in your bank was drained, your emails were hacked and be caught by surprised with your private video that has already been uploaded in the internet. Don't give them the chance to steal your private information. Don't tell me I didn't warn you! Be aware and secure first before selling it away!