Michael D Ford
SanDisk Ultra 64 GB microSDXC Class 10 UHS-1 Memory Card 30MB/s with Adapter SDSDQUA-064G-U46A fits very nicely in the HTC Vivid and the system recognized it right off the bat! Simple and easy to format the disk and then encrypting it was a snap as well. There are many reviews on the internet about this product possibly NOT working in the HTC Vivid....I am a believer in doing the research and reading the reviews. It works like a champ and the price was reasonable on Amazon!