I'll never ever assume that everything has been deleted just because I thought I did. I will make sure now on that all my important data has been completely deleted. Actually I have a very old PC that needs to have all its date deleted, that thing is so old tho... It's obsolete, but I still think it's important to make sure all is gone and can't be recovered easily. My best friend has always warned me about those softwares that can recover sensitive data , depending on how long ago that data was deleted.