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I'm running Ubuntu 12.04 64bit and I have an external USB 3.0 docking station. The docking station is made by Plugable and it has an ASMedia chipset (http://plugable.com/products/usb3-sata-u3).

In Ubuntu, when I want to remove a disk that I've connected via the docking station, I right click the disk and select "Safely Remove". The disk temporarily disappears from Ubuntu and I can hear it spin down in the docking station. However, after about three seconds I hear the disk spin back up and it reappears in Ubuntu (it reconnects). I end up having to simply power off the docking station without safely removing the disk from Ubuntu, which I would prefer not to do. I've tried different disks of various sizes from 3TB to 250GB but the result is the same. I've also tried a second docking station of the same model but the result is also the same. I have an external hard drive from Iomega that does not have this problem. However, the Iomega external hard drive is USB 2.0.

Has anyone encountered this type of problem before?

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3 Answers 3

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A number of people experience the same problem and for most people the behaviour is not consistent but seems to depend on the state of the OS.

This is a known bug: https://bugs.launchpad.net/ubuntu/+source/nautilus/+bug/792085

Still not solved, buying another type of disk may or may not help.

Workaround: Just unmount the drive and then unplug it, when unmounting the drive it will be synced before unmounting so it is safe to remove after that. Just don't use "safely remove" at the moment.

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Yes, I have the same problem. I unmount the external hard drive, then I select safely remove drive, and the drive icon disappears and the drive spins down. After a couple seconds it powers back on BUT the system will not detect it. If I remove the drive and unplug it then reinsert the drive the system still won't acknowledge its existence in any way (my external adapter does not have an off switch). Just to be clear, this is not a problem with remounting a drive but device detection.

I've tested it in another computer which mounted and removed with no problems, but putting it back in the first computer results in the same non-detection problem. I have to restart the system, but the system takes so long to turn off (likely because of this external drive issue) I've had to force a power-off by holding the power button for 5 seconds.

After restarting, the drive can be detected again. I found the only way to make the process work is to either:

1) Unmount the drive, safely remove it, wait for the drive to spin down and IMMEDIATELY unplug the AC adapter before it powers back on.

2) Unmount the drive but do not safely remove it as suggested by thorn.

Afterwards it will work if you plug the hdd back in. I really don't think it's a problem to only unmount the drive, but there are many arm-flailing paranoids who will throw a hissy-fit at the very thought of the concept. I do prefer, however, a solution that allows the process to actually work.

My system is somewhat peculiar, so that may be an issue. An untested chipset for Ubuntu perhaps...

My system is: HP Pavilion p6112f 2 hdd's internally connected 8Gb ddr2 ram CPU: AMD Phenom 8450 Triple-Core 2.10Ghz Ubuntu 14.04

Edit: On the same computer I'm using Mint Mate Debian edition, instead of the Ubuntu package based version. It has some similar bugs, but appears to have an automatic error correcting because after experiencing one of these discussed problems once, it doesn't a 2nd time. In other words: it works, use LMDE.

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The docking station is broken; get a different model.

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