Sony Optiarc BD-5740H-[01] SATA optical disc drive. This is a slim format drive used in small form factor computers (SFF) and in some laptop computers. See photos, one is shown installed in a SFF Dell Optiplex 9020 with working driver on Windows 10 Pro. Please check specs to see if it will fit/be compatible in your computer and notice that you may need a drive caddy for proper installation or drivers installed to get it to work depending on your OS. Listing is for x1 drive.