I inserted USB card reader with 2 volumes and it was not displayed on xfce
desktop although the system does see them as /dev/sdb.
I unplugged USB card reader and plugged in external USB HD with one volume. It
is displaye dproperly and interestingly it displayed the existing volumes on
HD.  I tried to eject them but it was not successfull. 
After that I unpluged external USB HD with one volume and plugged in again USB
card reader which displayed properly volumes in USB card reader. please advise.
I am willing to help and submit outputs of required commands.
Please chek here http://sprunge.us/bWJa
output of the command:
 a: ls -l /dev/* | curl -F 'sprunge=<-' http://sprunge.us
thanks