@sigma47 Just modify the title and add [solved] to it.

@hellothere I guess that the usb drive is formatted with a file system that doesn't support Linux file ownership, e.g. FAT32, exFAT, NTFS or the like. Hence the errors when mvtries to transfer the files' ownership to the new location, and maybe also the nonresponsive controls, as the ownership might be important for some of the files or directories in /opt.

You can check the file system with this command:

df -T | grep usb2

(df -T lists all mounted file systems, and grepfilters its output to just the lines that contain usb2.)

I've just had the same problem, and looking for a solution that runs on Linux, led me to looking in the Memcardrex code, I've come up with the following:

dd if=<file.gme> bs=1 skip=3904 count=131072 of=<file.srm>

It turns out the GME files are really just the same as SRM files with a 3904 byte header in front, the above commands strips that header and leaves a raw memorycard file.