Western Digital 160GB IDE (WD1600JB-55REA0) in KONIG Portable 3.5" HDD enclosure (CMP-MOBSTOR22)
Tested with USB Loader GX, no problems at all. Played Resident Evil 4 without problems or special settings.
Jumper on the HDD was on Slave
My wii has been on half the day now, playing different games (all of them over an hour each I think).
Only problem I had was SSX Blur not loading right the first time (graphical glitch, happened time to time with backup discs also), switching to IOS 223 to start it seemed to work (but then rebooting it in IOS249 might've worked also as the same occured with discloading sometimes)
If anyone still cares, same info in the format asked for below
Brand: Western Digital
Enclosure: KONIG Portable 3.5" HDD enclosure (CMP-MOBSTOR22)
Format: Tested both WBFS and FAT32 (whole drive)
Firmware/Softmod: 4.1E/hermes v4/cIOS38rev17
Loader: USB loader GX and configurable USB loader
I had it as WBFS running on GX first, but switched to FAT32 and cfg loader later on.
I ran mainly on IOS249 on GX, think I had cIOS38 rev17 (judging from files on my SD)
I run it on hermes v4 in cfg now
Neither setup has given me any trouble besides the SSX problem descibed above.