On Fri, 7 Mar 2014, David Mosberger wrote:

> Felipe,
> 
> Thanks for the tip about usbmon --- that looks interesting.  Of
> course, as luck would have it, turning on usbmon changes behavior:
> dd'ing to a mass-storage device (/dev/sda1) used to fail after
> ~500KiB.  With usbmon, it fails only after about 2MiB.
> 
> I attached two logs: first one is the usb-storage debug output without
> usbmon (fails after about 500KB of writing to /dev/sda1), second is
> with usbmon (fails about 2MiB of writing to /dev/sda1).

I didn't see anything unusual in the logs.  It looks like you'll have 
to use a bus analyzer to see the actual packets on the wire.

Alan Stern

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