Please check out all the details in this thread, where the USB problem in 9.1 is fully discussed and resolved.
Or for the condensed version:
Follow the advice here:
I switched off HOTPLUG_USE_SUBFS as recommended in /etc/sysconfig/hotplug.
I added the following line to my /etc/fstab:
/dev/sda1 /media/gizmo auto noauto,users,rw 0 0
I then manually created the directory /media/gizmo. After a restart I created a new desktop device, pointed it to the /media/gizmo directory and plugged in the USB stick, right clicked the drive on the desktop and it mounted like a charm, first time and no moaning.
That should do it. BTW 9.2 does not have the problem!