While I know there have probably been some issues similar to this... I have yet to find a solution for my problem, so I would appreciate your help if you can. =) I have a portable hard drive diskGO Edge 80g formatted to wbfs... My Wii reads it fine and back-ups I have on the hard drive run fine... The problem starts when I'm trying to back-up an .iso that has a rather large end size 4g+... Such as Little King's Story.... I've tried various wbfs managers, but after the process completes I get this error, and the back-up fails.. This particular error is from wbfs manager v3.. From what I've read the problem is that portable hard drive may not be getting enough power, and the connection from it to the computer becomes unstable over time... Thus larger .iso back-ups might tend to fail.