On 03/06/2015 11:44 AM, Marc Joliet wrote: <mega-snip> > What happens is that when I (cold) boot my desktop, my external Toshiba 3TB > drive (which is always connected via USB3) is detected, but cannot mount. It > *does* work once I unplug the USB3 plug and plug it back in.
I once hated replies containing the question "Does it work under Windows?" but a bit of experience with usb3 external drives has made me rethink the matter. Here's my thinking: if the usb3 drive works correctly with Windows but not with linux, the problem is software -- i.e. the device driver. The xhci driver is under heavy development because usb3 is still new tech, and I've found and reported a few bugs in the last year or so and they got fixed. If your Toshiba drive has no partitions formatted in an M$ filesystem, you could use gparted to make some free space on the drive and then create and format a new M$-readable partition just for testing purposes. I'm sure you don't have a Windows machine yourself, so you will need to make friends with somebody who does ;)
