Different sales channels, different brand identities, etc.

Different sales channels: OEM hard drives refer to hard drives provided by original equipment manufacturers, usually sold to system manufacturers or brand manufacturers as components of computers or other equipment. Licensed hard drives are products sold directly to consumers through formal channels.

Different brand logos: OEM hard drives do not carry the brand logo of the hard drive manufacturer, but appear as the logo of the system manufacturer or brand manufacturer. Licensed hard drives carry the hard drive manufacturer's brand logo.