You may do better posting in the SLES rather than SLED forum
https://forums.suse.com/forumdisplay...erprise-Server

I can't try recreating this issue as I don't have a SLES install with any sort of graphical environment installed, but I wonder is this will help:
http://www.novell.com/support/kb/doc.php?id=7003564
The page says it applies to SLES and SLED but I've never seen a root password prompt for mounting USB media in SLED. This post by says that in SLES only root can mount USB devices and it's Malcolm saying it so I believe it
https://forums.suse.com/showthread.p...4957#post14957

Maybe mounting the drive manually would help.
Code:
$ mkdir /media/foo
$ mount /dev/whatever /media/foo
The value of whatever can be found by looking at the output of dmesg after you attach the USB device. E.g. If dmesg says the device has been allocated /dev/sdd then replace whatever with sdd1 to mount the first partition.