I had been using a Saicoo card reader (FBA_S0201B-SSM) which was working fine on macOS 13 (Ventura). Upon upgrading to Sonoma 14.0, the reader stopped functioning. I then purchased the Belkin F1DN008U card reader and it works out of the box with no additional drivers. I also have heard success with the Identiv SCR3310v2.0 card reader on macOS 14.0. Hope this helps if someone is encountering the same issue. It appears like there may be some card readers that stop functioning on macOS 14.0 due to the built in driver not being compatible.