All modern hard drives definitely have sectors marked as bad.

That part of what he's saying is true. I don't dispute that.

I don't think that what he's saying is likely, but it's hardly utter bullshit.

What I'm calling BS on is not the fact that bad-sector testing is done. It's his statement that a 120gb drive is the same thing as a 250gb drive that was just rated lower in testing.

Yes, they test the drives for bad sectors and mark them off, but the bad sectors are a miniscule sliver of a fraction of the drive's total capacity. Not 50 percent of the capacity as he implies.