HP 781415-001 is an 8X Slim-slot DVD-ROM optical drive for reading DVD-ROM discs. Its slim form is intended for systems designed to accept this style of optical drive, providing a way to use DVD-ROM media in a compatible computer.
The drive has a 9.5 mm small form factor. It is listed without a holder, so the part is the optical drive itself rather than a holder assembly. The 8X DVD-ROM designation distinguishes it from the separate DVD writer and Blu-ray drive options in HP’s parts listing.