Elastic mounting is of course much better because it absorpts practically all vibration, it's like hanging something on rubber band...cool can anyone point me to stuff/products about this elastic mounting/rubber grommets? Think I've got some of the rubber grommets if we're thinking about the same thing. So is elastic or rubber better?
Mechanically it's just not the safest mounting method and you would have to make sure materials are such that they don't deteriorate: In other forum someone said that he had attached fan to heatsink with two rubber bands and few days later one of them had already broken. Should be easy to think what failing of suspension could do to HDD...
Soft mounting with rubber grommets is compromise between it and hard metal to metal mounting and absorpts some vibration while retaining physical holding ability.
http://www.techpowerup.com/reviews/LianLi/PC-A70/images/hdd3.jpg
http://www.techpowerup.com/reviews/LianLi/PC-A70/images/hdd2.jpg
http://www.silentpcreview.com/article249-page5.html
Downside is that it won't stop all vibration so vibration proofness of case is still important.