Yes, it is possible to connect an external DVD drive to an XGIMI Horizon Pro projector via USB, but with some restrictions.

- The XGIMI Horizon Pro supports USB ports that provide enough power to operate TV sticks and other USB devices.
- However, the external DVD drive must be compatible with the projector's Android TV system, which is not guaranteed. Most external DVD drives are designed for PCs and laptops and may not work directly with the projector's Android TV system.
- An alternative solution would be to copy the content from the DVD to a USB drive or external hard drive and then connect it to the projector, as the projector supports local files and media sources via USB.