I have a PQI USB 2 256 Mb flash drive which mounts perfectly fine as /dev/sd1 at /home/system/var/mnt/usbhdd. It appears in the System Info app as a "USB Mass Storage Device."
I also have an Intuix USB 2 128 Mb flash drive which doesn't mount at all. It appears in the System Info app as a "USB disk." However, when I do a df I can see it hasn't been mounted.
Here's the output of dmesg after I plug the Intuix USB key in:
Click to view attachment
I have not reformatted either of these drives. I've used the Intuix one on Macs and on PCs (so it's littered with annoying dotfiles), and the PQI one on PCs only.
I would be so glad for any help anyone can provide!