Hello,
I have 2 Hard drives on my wii (cIOS 2x7final).
I noticed that some homebrews always shows only one hard drive.
The funniest part is that the recognized HDD is not the same in every homebrew:
WiiMC show the port 1 (like SNESGX, FCEUGX, VBAGX, WiiSX, NeoCD Redux, WiiMednafen
and others...