In the end, if you’re device was host to some very sensitive data, why chance it? Demolish that fucker and buy yourself some piece of mind.
There are a lot of tools available to help users properly sanitize a hard disk, such as BitRaser and BitBleach. Used properly, these will generally overwrite data thoroughly enough that most commercial forensic data-recovery tools will be fairly useless. ”Frantz” recommends using DBAN, also known as Darik’s Boot and Nuke.