Couldn't it just be that because of airflow they designed it so that it could only be positioned in a horizontal way.
And because of that decision they build in a drive that is only usable in that same position.
I'm just guessing here but there must be a difference in drives that can be used in only a horizontal position and those that can be used in both?
Could it be this simple?
It is that simple and I even mentioned it earlier in this thread. Standard disc drives can't just be turned on their side - they'll likely scratch up your disc if you do that. Microsoft clearly just made the decision not to go with a drive that allows being turned on its side and they're letting people know it now. Only one person here is pretending like that means they used the cheapest of cheap parts implying the drive is going to be crap somehow.