Re: Weird USB errors on HD

[Greg KH <greg@kroah.com>]

On Tue, Jul 19, 2005 at 12:47:32PM -0400, Karim Yaghmour wrote:
> 
> I have a usb-attached HD that I use from time to time. When it's connected
> to my desktop through a hub it works flawlessly. When connected to my Dell
> D600 Laptop, however, it sometimes randomly exhibits a loud click (as if the
> heads went berzerk) and the device goes unrecognized (i.e. the USB layer drops
> the device and then redetects it again; meanwhile there is FS corruption.)
> 
> The same behavior happens with 2.4.x and 2.6.x
> 
> In /var/log/messages I see something like:
> hub 3-0:1.0: over-current change on port 1
> hub 1-0:1.0: over-current change on port 3
> ...
> usb 1-3: USB disconnect, address 2
> usb 1-3: new high speed USB device using ehci_hcd and address 3

Ugh, you have a bad device or power supply, or aren't giving it enough
power to drive the thing.  Nothing we can do in Linux for that, sorry.
Buy a wall-powered usb hub, that usually helps.

Good luck,

greg k-h
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