I see no entries for sdb1 in the output of mount. And note that /dev/* are the device nodes for devices. If you wish to access them as filesystems you access them via their mount points. According to mount /dev/sdb1 is not mounted anywhere.
The output of mount on your system seems to be rather weird. For example, why is sda1, which I assume is your primary drive mounted at /host with fuse?
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