Hi,
the same problem her with Asus E200HA, 64bit, Ubuntu Gnome 16.04 LTS.
The harddisk at USB3 works once when connected at startup, but never again when 
disconnected.

SYSTEM INFO
                       system         E200HA (ASUS-NotebookSKU)
/0                     bus            E200HA
/0/0                   memory         64KiB BIOS
/0/a                   memory         2GiB Systemspeicher
/0/a/0                 memory         2GiB DIMM DDR3 1600 MHz (0,6 ns)
/0/a/1                 memory         DIMMProject-Id-Version: lshwReport-Msgid-B
/0/11                  memory         224KiB L1 Cache
/0/12                  memory         2MiB L2 Cache
/0/13                  processor      Intel(R) Atom(TM) x5-Z8300  CPU @ 1.44GHz
/0/100                 bridge         Intel Corporation
/0/100/2               display        Intel Corporation
/0/100/b               generic        Intel Corporation
/0/100/14              bus            Intel Corporation
/0/100/14/0    usb1    bus            xHCI Host Controller
/0/100/14/0/1          multimedia     USB2.0 VGA UVC WebCam
/0/100/14/0/3          communication  Bluetooth-Schnittstelle
/0/100/14/0/4          input          U+P Mouse
/0/100/14/1    usb2    bus            xHCI Host Controller
/0/100/14/1/1          storage        External USB 3.0
/0/100/1a              generic        Intel Corporation
/0/100/1c              bridge         Intel Corporation
/0/100/1c/0    wlp1s0  network        Qualcomm Atheros
/0/100/1f              bridge         Intel Corporation


CONNECTION MESSAGES
[  231.291890] usb 2-1: new SuperSpeed USB device number 3 using xhci_hcd
[  231.310300] usb 2-1: New USB device found, idVendor=0480, idProduct=a202
[  231.310324] usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[  231.310338] usb 2-1: Product: External USB 3.0
[  231.310350] usb 2-1: Manufacturer: TOSHIBA
[  231.310362] usb 2-1: SerialNumber: 20151231001889C
[  231.312379] usb-storage 2-1:1.0: USB Mass Storage device detected
[  231.316046] scsi host0: usb-storage 2-1:1.0
[  253.805170] usb 2-1: Disable of device-initiated U1 failed.
[  258.800433] usb 2-1: Disable of device-initiated U2 failed.
[  258.968598] usb 2-1: reset SuperSpeed USB device number 3 using xhci_hcd

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https://bugs.launchpad.net/bugs/1242321

Title:
  USB 3.0 Harddrive not recognised

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