If you have modded your Nintendo Wii, you already know that USB Loader GX is the gold standard for launching backups from a hard drive. However, the single biggest point of failure for most users isn't the software—it's the hardware. You can have the perfect cIOS setup, but if your USB drive isn't compatible, you will face the dreaded black screen, random freezes mid-game, or the "Waiting for HDD" spin-up loop.
The Wii’s USB bus, paired with cIOS (custom IOS), cannot reliably address drives larger than 2TB. If you plug in a 4TB or 8TB drive, the loader will crash or freeze during index. Exclusive Tip: Even if a 3TB drive spins up, you will corrupt your game data. Stick to 2TB or less. usb loader gx usb compatibility list exclusive
HP v165w Series: Often fails to load into USB Loader GX entirely. The Ultimate USB Loader GX USB Compatibility List
This list is broken down into three tiers: Platinum (Perfect), Gold (Works with tweaks), and Red (Avoid at all costs). Western Digital My Passport (Gen 1-3, USB 2
Here is a helpful review and breakdown of the current state of USB compatibility for USB Loader GX, what to look for, and how to avoid common pitfalls.
Avoid like the plague: PNY Elite-X, Lexar JumpDrive, and any "Dual Drive" (USB-C + USB-A). These have aggressive power saving that causes the Wii to crash during cutscenes.