One of a few scientific discoveries made. This paper covers an instruments used to observe the standing wave dynamics of a flexible spinning disk. We discovered the the standing wave can instantaneously switch states when the disk is impinged by a disk drive recording head at a particular radius and spped of rotation. This is the world of Zip drive engineering was called disk snap. The Zip drive operational states needed to be designed to avoid this disk snap or else the servo tracking would be interupted possibly during writing data and hence destroy data areas on the disk.