To view a list of drives and partitions:
To view what is already mounted and where:
Normally you have to creat a directory to mount a fs too before mounting and then mount to that location. You have to define a partition number to mount on the drive instead of just sdb it should be something like sdb1 for partition 1:
su -c 'mount /dev/sdb1 /media/some_name'
Hope this helps