[Elecraft] MSD question for PX3

[Mike Parkes]

Hello group, happy holidays!
Hey I am trying to get the PX3 working with a usb sd card reader (which
works fine on the pc)... and when I plug this into the USB port on the px3
the display just freezes up, no "M" appears on the display. I have tried
plugging this in both with and without an SD card in it, and same results
the px3 freezes until I unplug it. Is this the wrong kind of drive? Thanks
for any help.
Mike AB7RU