Linux users must have read-only permissions for the removable device they wish to connect to the target. For /dev/sdb1 run the following as root user:
root@administrator-desktop:~# chmod 664 /dev/sdb1
root@administrator-desktop:~# ls -l /dev/sdb1
brw-rw-r-- 1 root disk 8, 17 12-03-2010 12:02 /dev/sdb1
The drive is then available to connect to the target.
See Also
Virtual Media in a Linux Environment
Active System Partitions
Mapped Drives
Drive Partitions
Root User Permission Requirement