Thanks for answering.
I was using a USB hub to ditch the y-cable and power the HDD from the hub instead but like you said this doesn't work with vWii USBloaders strangely enough I could play Gamecube games but not Wii games.
But i've traded my HDD for a powered one and now the problem is solved.
I just got a Toshiba Canvio Basics 2TB Exclusive and it already seems like I might need to return it or trade it for another HDD because USBLoaderGX or any USB loader won't load Wii games and some won't detect the device at all.
On USBGX I'm using IOS58 and IOS249dx2-v10-52/53 and IOS249 (250...