J.A. Magallón wrote:
quoted text
> I'm still pending to pysically remove the disks (or at least unplug the
> cable...), but I have realized a cusious thing: after some errors, the
> kernel is lowering the disk speed (UDMA/133, then 100, then 33):

That's the standard error handling behavior.  Timeouts are likely to
indicate transmission problems so libata puts it into slower gear.

quoted text
> Perhaps this gives a clue.
> Or I just had bad luck and 2 of my 4 disks broke at the same time.

As I said, the first thing I would try is to connect the drives to a
separate PSU and re-seating cables as you're seeing problems on two
drives simultaneously.

-- 
tejun
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