X4100 mount command for second drive shows device already mounted

I have a new x4100 system and I created a new partition and ext3 filesystem on the second drive. When I try to use that partition I get the error:
mount: /dev/sdb1 already mounted
Since this is a new system, that partition has never been used and I can't see anywhere that the device is in use. I tried the same thing on other systems and I get the same error. Has anyone seen this problem and if so how was it resolved?
thanks

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