My keyboard (Logitech K350) will work if my portable Western Digital HDD (this one) isn't plugged in.
My portable HDD will work regardless.
I've taken my keyboard USB dongle out of the USB 3.0 slot (i have 2) & put it in another (2.0) slot. They still wont work together.
Basically i type on my keyboard & nothing happens.
How to put right?
Is there any error in device manager?
Does the hard drive draw it's power directly from the usb? (Usb ports can provide some power for usb hard drives, but not necessarily all the power the drive needs so it could be a consideration)
Does the keyboard work if the hard drive is plugged to usb 2.0?
Do you have a powered by mains usb hub you can try?
There's always better troubleshooters than me, but it's just a few things you could try while you're waiting