Can a CF Express card reader reads old plain CF cards? I don't find too many CF card reader for sale. I need a new one for my many devices that use CF card.
No, they are different physical sizes, CFE is smaller.
I just had this situation upgraded to cf and sd2 cards for my d850 from xqd and sd1. I bought a usb3 reader that reads both cf and sd2 from Bhphotovideo.com.