The HP DVD+/-RW Double-Layer SuperMulti optical drive, 907721-001, is a replacement optical drive listed for HP ProBook 450 G4 models. It is designed for notebooks that use this specific drive part.
Its confirmed format is DVD+/-RW Double-Layer SuperMulti, making it suitable for optical-disc tasks supported by that drive type. HP’s maintenance guide documents removing and installing the optical drive in the notebook. The guide treats the drive bracket as a separate component, so it is not confirmed as included with this part.