Playstation 5 Future Update May Allow Games to Be Stored on USB Drives
https://wccftech.com/playstation-5-usb-drives/
PlayStation 5 games can only be stored and played from the console's SSD at launch, but there's the chance that it will be at least possible to store games on a USB drive.
In a new PlayStation 5 FAQ that has been posted on the Official PlayStation Blog, it has been confirmed that Sony is exploring the possibility of letting players store PlayStation 5 games on a USB drive with a future update.