The keyboard that your eMac uses is just a regular USB keyboard. It is not PPC or Intel, just USB.
Plugging a USB flash drive into the keyboard can produce the Low Power warning as the USB hub in the keyboard usually only supplies enough power for something like a mouse.
The USB ports on your Mac Mini should have no problem recognizing any USB Flash drive.
The normal format for a thumbdrive is FAT32, out of the box, and is readable by most computer Operating Systems.
What exactly happens when the Flash drive is plugged directly into the back of the Mac Mini?
Any activity at all?
HI, I've problem with Kennington "Data Transfer" and mac-mini-intel ports i.e. the mini will not recognize my USB Flash/thumb drive. However, the mini will recognize the flash drive, if it is plugged into my Emac( PPC ) keyboard first. If I plug into mini port first and then plug into Emac keyboard I get a warning alert! the device is drawing to much power and the port will be shut down to protect equipment, but the port does not shut down and the flash continues to be recognized and functions normally.. I have tried multiple partioning, security options and format options --e.g MS-DOS-FAT and GUIDE etc--- and nothing gets the mini to driectly recognize the flash drive except the PPC keyboard....Xfun