Hi just a quick question, i've been searching online to find out if there is any measurable frame dragging effect on a high rpm massive rotating disc, but havnt been able to find anything. Ive read a bit about gravity probe B but in my limited understanding of the effect and the physics around it, i thought it might be possible to see this effect in the lab provided the effect at this scale is not so negligible as to see no result. In the experiment would you see any frame dragging if you were to rotate a number of massive discs very close to non rotating discs in a perfect vacuum so as to cancel any drag effects due to air - in this setup the arrangement of discs would look like the multiple discs of a hard drive platter (but much larger and much more massive) where every other disc is made to rotate in very close proximity to a set of non rotating discs (but with high quality bearings so that they can rotate if made to do so) I imagine that if there was a frame dragging effect the rotating discs would eventually cause the non rotating discs to start to rotate? I'm not sure if there would be other effects that may be stronger than the frame dragging effect but therein lie another of my questions? any comments would be very much appreciated Cheers!