Acoustic management is not enabled on the SATA Barracudas like there is on the IDE versions, which is probably why it is thrashing louder.
From Silent PC Review:
7200.7 does not allow user control over AAM. At idle, both the SATA and PATA versions are very quiet, about on par with the Barracudia IV. Seek with PATA may be almost as good as the IV; it is not clear whether AAM is turned off/on on all production. The SATA models definitely do not have AAM turned on, and their seek/write noise is much higher. Some very quiet PATA samples have surfaced, mostly from Seagate's new China factory, but findings are inconsistent. Check user comments in many forum threads.
(Edited to reflect some more research on my part).