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I have a Toshiba 2T hard drive that makes clicking noises rather than mounts. Also have a Nikon Colorplex that doesn't mount. 14.04 is up to date. Here is the dmesg tail for the hard drive.

[ 2980.500891] usb 3-3.5.3: new high-speed USB device number 10 using xhci_hcd
[ 2980.546292] usb 3-3.5.3: New USB device found, idVendor=0480, idProduct=0200
[ 2980.546300] usb 3-3.5.3: New USB device strings: Mfr=2, Product=3, SerialNumber=1
[ 2980.546305] usb 3-3.5.3: Product: External USB 3.0
[ 2980.546309] usb 3-3.5.3: Manufacturer: TOSHIBA
[ 2980.546313] usb 3-3.5.3: SerialNumber: 20140105001491F
[ 2980.546540] usb 3-3.5.3: ep 0x81 - rounding interval to 16 microframes, ep desc says 20 microframes
[ 2980.546549] usb 3-3.5.3: ep 0x2 - rounding interval to 16 microframes, ep desc says 20 microframes
[ 2980.547098] usb-storage 3-3.5.3:1.0: USB Mass Storage device detected
[ 2980.547270] scsi7 : usb-storage 3-3.5.3:1.0
[ 2981.546323] scsi 7:0:0:0: Direct-Access     TOSHIBA  External USB 3.0 0    PQ: 0 ANSI: 6
[ 2981.546623] sd 7:0:0:0: Attached scsi generic sg3 type 0
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just noticed,, it also killed my primary monitor. have to reboot! – Barry vT Jun 11 '14 at 22:05

Well, I found my own answer The hard drive wasn't getting enough power. The Western Digital USB hard drives work ok off my USB hub, but the Toshiba needed a shorter cable to operate properly.

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