On Aug 2, 2006, at 8:16 AM, Bernaldo de Quiros, Iban 1 wrote:

...This error is not happening in exclusivity with this two device
files it also happening with other device files...

Iban -

A situation like that suggests a device driver problem.  (The device
files serve to identify the device driver to be used in interacting
with the devices.)  It may be that the device driver is the wrong
type or level, where it would malfunction when presented with a
request it does not understand, or may have a defect.

   Richard Sims