[Bug 44332] Re: device nodes not being created for external usb harddrive

[Ben Collins]

*** This bug is a duplicate of bug 41229 ***

Pretty sure this is a USB2 problem. Try doing the following command
after disconnecting the drive: sudo rmmod ehci_hcd

You should then be able to plug the device back in and have it mounted.

** This bug has been marked a duplicate of bug 41229
   ehci_hcd prevents card reader from automount

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device nodes not being created for external usb harddrive
https://launchpad.net/bugs/44332