That's what I thought. I figured most Forum members reading the question were just getting a good chuckle..."Look here Jimmy, this idiot is looking for a 3.5HDD that's NOT even a 3.5 HDD!"
But, I had to ask.
I'll be going with the 2.5" format to make things fit.
(Playing around with a LianLi PC-Q02 case.)
Thank you for terminating my fruitless Google search for something that doesn't exist.