Nothing will be spared

as far as data is concerned, including the toughest virus' and malware by using Ddban.
You have multiple methods of erasing right up to military secrecy strength of erasure which will allow for any level of paranoia (like mine).
Virus like Conficker (Downadup) were able to reactivate after quick format, although full format got the job done, but there is nothing like not having that nagging doubt.