I've had a Seagate Momentus 5400.3 ST980815A mounted loosely on a sponge at a slight 10-deg diagonal angle for a while. SMART gives about 5 years in power-on hours and there's been no problems.

I suspended my JVC-enhanced Samsung SP1614N, and while it totally got rid of vibration and made the seeks even more quiet, I didn't feel safe having the drive dangling on elastic bands. Instead I got a yellow rectangular car wash sponge (new) and cut a hole in it, so that when the hard drive is plac...