I also have this problem on 10.10 amd 64 Usb drives are not seen when plugged in. if I run Dolphin as a user not Root or sudo the Usb drive is seen. If I mount it from Dolphin and then exit dolphin I can see it on the desktop and Nautilus also sees it. Nautilus will un-mount it but can not see it if replugged.
This problem has arisen in the last month. Also related when I click on "places" " home" I get Dolphin but if I click "places" then " computer" I get Nautilus Phil -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/564459 Title: USB devices not detected when hotplugged -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
