Not able to mount usb device "mount: /dev/sdb already mounted or /mnt busy"

Solution Unverified - Updated -


  • Unable to mount usb drive. It is giving below error although it is not mounted:

    $ mount /dev/sdb /media/usbdisk
     mount: /dev/sdb already mounted or /media/usbdisk busy.


  • Red Hat Enterprise Linux 4
  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • Device Mapper Multipath

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