On Tuesday 27 December 2011 15:40:05 Момчил Иванов wrote:
> At Tue, 27 Dec 2011 15:29:02 +0100,
> 
> Момчил Иванов wrote:
> > At Tue, 27 Dec 2011 15:17:42 +0100,
> > 
> > Hans Petter Selasky wrote:
> > > Did you check for errors in dmesg?
> > > 
> > > Also have you tried setting:
> > > 
> > > hw.usb.ehci.lostintrbug=1
> 
> does not seem to help at all, it seems to make things even worse - the
> stalls become more frequent... other ideas?
> 

Hi,

If you compile a kernel with "options USB_DEBUG". Then when the problem 
appears, you enable umass debugging:

sysctl hw.usb.umass.debug=15

OR:

Check activity with usbdump upon failure:

usbdump -i usbusX -vvv > log.txt


cat log.txt | grep USB_ERR

Some USB HDDs might have firmware failures. Most USB HDD enclosures are not 
100% hardware and usually contains a small CPU to do USB.

--HPS
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