Amazon.com: XPACK Hard drive Enclosure with USB Media Hub For 2.5” Internal PC Hard Disk Drive Compatible with XBOX One and XBOX One X5" (HARD DRIVE NOT INCLUDED) : Video Games
Xbox One S HDD
Xbox One HDD is non-removable, USB 3.0 supports external storage - Polygon
Xbox ONE Original Replacement 1TB Internal Hard Drive
In case anyone was wondering. This is the hard drive that comes in the Xbox One X. : r/xboxone