vajflores :
ollpu :
The data might not be completely wiped, and some of it can be retained with special software. You will have to use a tool, that writes zeros on top of the old data, so it can't be recovered.
Thanks. It's going to a needy children in our community and someone is going to install open source software on it before giving it to the kids. So perhaps then what I'm doing is enough? (Wish I could leave Windows on it for them).
It will be enough, if the software completely re-writes everything. That is probably not going to happen.
When you just delete files on your hard drive, the data will stay there, your OS only deletes the path to that file. Once that space needs to be used, it will be written over.