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I have an external 1TB USB 3.0 HDD (NTSF formatted) and a laptop with two USB 2.0 and two USB 3.0. My laptop runs Ubuntu 13.10 with XFCE. For a few weeks, I have used my HDD and it was always auto-mounted in /media/username/hddlabel. For some reason, it is no longer mounted when I attach it to the USB ports. I can see it on either port when I do

lsusb

or

sudo fdisk -l

but fdisk takes comparably long (a few seconds) while "hanging" on the HDD. I can then manually mount it with

sudo mount -t ntfs /dev/sdb1 /media/username/hddlabel

but then I can't unmount it from nautilus/nemo because it was mounted as root (it needs to be) and I'm not root.

Sometimes however, it just works and I'm under the impression that it's more likely to work when I pick another USB port and I feel it's more likely to work on a USB 2.0 port.

How can I find out what's different on occasions when it works compared to when it doesn't work and how can I make it automount reliably (i.e. whenever I plug it in)?

Edit:

Following Marius' advice, I did

dmesg | grep usb

which got me the following output:

// plugged HDD into USB 3.0 no. 1

[  268.013900] usb 4-2: new SuperSpeed USB device number 3 using xhci_hcd
[  268.030620] usb 4-2: New USB device found, idVendor=1058, idProduct=1078
[  268.030622] usb 4-2: New USB device strings: Mfr=2, Product=3, SerialNumber=1
[  268.030623] usb 4-2: Product: Elements 1078
[  268.030624] usb 4-2: Manufacturer: Western Digital
[  268.030625] usb 4-2: SerialNumber: 575848314539335548553930
[  268.387812] usb-storage 4-2:1.0: USB Mass Storage device detected
[  268.387854] scsi6 : usb-storage 4-2:1.0
[  268.388157] usbcore: registered new interface driver usb-storage
[  310.040731] usb 4-2: Disable of device-initiated U1 failed.
[  315.036788] usb 4-2: Disable of device-initiated U2 failed.
[  315.148849] usb 4-2: reset SuperSpeed USB device number 3 using xhci_hcd

// unplugged HDD HDD from USB 3.0 no. 1

[  925.991483] usb 4-2: USB disconnect, device number 3
[  925.993425] usb 4-2: Set SEL for device-initiated U1 failed.
[  925.993428] usb 4-2: Set SEL for device-initiated U2 failed.

// plugged HDD into USB 3.0 no. 2

[ 1089.424577] usb 4-2: new SuperSpeed USB device number 5 using xhci_hcd
[ 1089.441414] usb 4-2: New USB device found, idVendor=1058, idProduct=1078
[ 1089.441422] usb 4-2: New USB device strings: Mfr=2, Product=3, SerialNumber=1
[ 1089.441427] usb 4-2: Product: Elements 1078
[ 1089.441430] usb 4-2: Manufacturer: Western Digital
[ 1089.441433] usb 4-2: SerialNumber: 575848314539335548553930
[ 1089.442239] usb-storage 4-2:1.0: USB Mass Storage device detected
[ 1089.442407] scsi7 : usb-storage 4-2:1.0
[ 1128.226549] usb 4-2: Disable of device-initiated U1 failed.
[ 1133.219955] usb 4-2: Disable of device-initiated U2 failed.
[ 1133.332034] usb 4-2: reset SuperSpeed USB device number 5 using xhci_hcd

Today, none of the attempts to automount worked while yesterday night, the device was successfully detected in USB 2.0 and USB 3.0 slots after the laptop had been shut down and restarted.

share|improve this question
    
You may provide more info by looking at dmesg, searching its (long) contents with something like: dmesg | grep /dev/sdb, dmesg | grep HDD, dmesg |grep -i USB, and so on. Please post the utput, if you find anything relevant. –  MariusMatutiae Jan 29 at 14:07
    
I have the same problem - Western Digital - 2.5" 1TB USB3 - WDBUZG0010BBK - same messages. Did you find a solution yet? –  frans Jun 13 at 12:42
    
unfortunately not. My workaround is to add the hdd to the fstab on all of the machines where I use it. I'm using the nobootwait option to prevent getting an error when it's not present. –  casualcoder Jun 13 at 12:49

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