[shrubble]

I have definitely had issues even with Intel based systems that were Sata-1 in working with Sata-2 drives; I think that being a first generation chipset it was not well supported in terms of anomalies that showed up with how the specification was implemented by different vendors.

[Sevan777]

I suspect you're right and the firmware changes have likely covered compatibility with SATA II and missed these edge cases with legacy SATA I controllers.