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symlinks should work fine. i use them with all the systems, and the sselph scraper. if your symlink is set correctly, the rom file structure should look exactly the same to anything accessing it, as if it was in the normal place.

the only problem i had was making sure the usb auto-mounted each boot, and with the right permissions. i can’t remember how i did this, but as a linux newbie i just googled until i found something to copy :) it was something to do with fstab and fat32 permissions. my /etc/fstab looks like this:

proc            /proc           proc    defaults                0       0
/dev/mmcblk0p1  /boot           vfat    defaults                0       2
/dev/mmcblk0p2  /               ext4    defaults,noatime        0       1
# a swapfile is not a swap partition, so no using swapon|off from here on, use $
UUID=E44B-FC4E  /media/usb      vfat    nofail,user,umask=0000  0       2

(last line is the usb)