David Long, president of Staticworx (www.staticworx.com), says:

It is important to point out a key distinction about static control flooring in data centers; research has shown that there are only two forms of static control flooring capable of reducing static charges on people when they are wearing regular shoes. EC rubber and static control carpet. The same studies have shown that significant amounts of static can be generated on people wearing standard footwear while walking on static control vinyl, conductive/dissipative epoxy and static dissipative high pressure laminates.

Carpet also prevents static generation, but it is rarely used around servers and storage equipment due to air contamination from loose fibers and its tendency to trap dirt and other contamination. One further detractor is the difficulty rolling systems and castor chairs over carpet.