On Mon, 8 Jun 2015, Oliver Neukum wrote:

> On Sun, 2015-06-07 at 12:13 +0000, James wrote:
> 
> > [  142.892218] EXT4-fs (sde1): mounted filesystem with ordered data
> > mode.
> > Opts: (null)]
> > 
> > cp to drive
> > drop is next
> > 
> > [  234.054404] usb 3-1: reset SuperSpeed USB device number 2 using
> > xhci_hcd
> > [  234.357368] usb 3-1: reset SuperSpeed USB device number 2 using
> > xhci_hcd
> 
> A lot of resets with no reason. You need to enable debugging
> for the storage driver.

A usbmon trace would be easier to read and just as good for debugging.

Alan Stern

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