Service mark symbol. The service mark symbol (â ), the letters SM in superscript style) is a symbol used in the United States to provide notice that the preceding mark is a service mark.
Size matters: The micro and mini USB connectors are of similar width. But the micro connector is much thinner (smaller vertical dimension). Some product designs were not able to accommodate the height of the mini receptacle and the new thinner receptacle will encourage and allow thinner products.
Even the micro USB end is quicker on the Ultra Dual USB Drive 3.0 with a read speed of 28MB/s and write speed of 20MB/s compared to the read speed of 15MB/s and write speed of 10MB/s on the Ultra Dual USB Drive 2.0. I also moved a large video file onto each drive to check their real world usage.