Samsung, as far as I'm aware, doesn't manufacture such media and will therefore rebrand a media manufacturer's products under its own name.
It could well be Verbatim supplying the media and it's not unusual for rebranded products to be cheaper than the original brand...:-)
If you go to click here you'll find, under Quality on the left pane, details of who manufactures media and which companies rebrand it under their own name.
The reason is simple - no manufacturer can produce everything it sells and therefore it turns to a specialist for reasons already outlined.
In the case of Samsung I can give you one example. About 12 years ago we bought number two child (now an IT support specialist) a Samsung video camcorder on special offer for his 21st birthday.
To his surprise he discovered it was, in fact, a rebranded Sony model. As a Sony devotee he was naturally thrilled....:-)