I have an old hard disk (Maxtor 250Gb) from about 3 years ago that started giving errors and now sits in a draw in my desk. It has some confidential data on it but it's unlikely that it can be read because the disk started to go bad. However, before I dispose of it I want to make sure that the data can't be recovered by destroying the disk.
What is the best way to destroy the disk such that the data can't be read? (I live in Arizona and was thinking of leaving it in the yard when we have those 125 F days...?)
What is the best way to dispose of the disk after it's destroyed? (I believe that it's environmentally unsound to chuck it in the trash.)