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SATA devices may not be detected at the 3 Gb/s ports of B2 stepping Intel 6 series and mobile 6 series southbridge

Problem description
SATA link(s) performance may degrade over time on some B2 stepping Cougar Point PCH southbridge. Links will develop increased bit error rates and failed transfers have to be retried upon error detection by the SATA controller. As the wear out continues performance will get worse as the SATA controller will spend more time retrying failed transfers than it will spend on sending actual data. At some point things will get so bad that attached devices will be disconnected because of unreliable link from unstable clock and will not be detected at all.

Root cause
Southbridge erratum #14.
Affected southbridge

H67, P67, HM65, HM67

Solution
None, use only the two 6 Gb/s ports until manufacturer replaces existing B2 PCH systems exhibiting problems at the 3 Gb/s SATA ports with B3 stepping. B3 stepping will be available on late April though.