[Banana Hammock]

Positive.

The reasons I can think of off the top of my head to explain the sudden increase in noise is that the vibrations from the hard drive is causing the entire case to resonate and amplify the noise or the new case is much thinner than the old case so it doesn't do as good of a job to dampen the noise.

How is the drive installed in the case? Is it screwed directly to metal? Are there any any physical differences in construction between the new and old case? Does the new one feel thinner than the old?