Holla from the east side playa!! o.0
Here's the deal. With regards to 1, check if DMA is enabled on that channel for the hdd. What other devices (if any) are attached to that channel?
2 it seems there is just lots of vibration of the hdd in the case. What I suggest is u check that everything is tight and the screws r secure. If that doesn't work, put a tad of felt padding between the hdd and metal of case to absorb it.
SEX is like math. Add the bed, subtract the clothes, divide the legs, and hope you dont multiply