On Tue, 15 May 2007, Damjan Jovanovic wrote:

> Hi
> 
> In the past 4 years, I've had problems with at least 3 different USB
> flash disks, across kernels as far back as the early 2.4 series and
> still occuring on 2.6.20-15 (Ubuntu 7.04). During heavy usage, the
> flash disks hang with the following errors and need to be unplugged
> and plugged back to be used again.

These are often low-level hardware or communication errors.  They could
be caused by bad cable connections or electromagnetic interference.

If you want to get more precise information, try using the usbmon 
facility (instructions are in the kernel source file 
Documentation/usb/usbmon.txt).
  
Alan Stern



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