EtcherPro is able to flash standard USB drives (like thumb sticks, SSDs, hard drives) and SD/mSD cards. It can also flash some compute modules like the RPi CM3 or boards like the balenaFin.
If you have a particular drive or board and want to know if it is supported on EtcherPro, the best thing to do is to download the free and open source Etcher application on your computer and test if you can flash an image to the particular drive successfully.