When you format a HDD it completely erases everything!
In that other thread the user had a bad HDD, he wasn't doing housecleaning. And I was corrected like 5 times, a 'low level format' isn't possible, that program just writes zeros across the disk (erases everything). I tried contacting the developer, he didn't reply.
If that program erased your boot drive it is a shame, there should have been warning prompts telling you what was going to happen.