Review on 📸 SanDisk 128GB Extreme microSDXC UHS-I Memory Card with Adapter - Up to 160MB/s, Class 10, U3, Video Speed Class 30 (V30), 4K Ultra HD, Application Performance Class 2 (A2), Micro SD - Model: SDSQXA1-128G-GN6MA by Nathan Akers

Anyone claiming green back microsdxc cards are fake should do their due diligence. Throughout Sandisk's marketing they show a green backed microsd with "XC" instead of "HC". All reviews on authoritative websites show the same thing. Second, anyone who complains about a lack of storage does not understand how marketing for mass storage media works. They calculate the size based on 1000 kilobytes per megabyte, not 1024 kilobytes per megabyte. If you bought the 128GB model, your device will show it as 119GB because your device calculates it as 1024KB per 1MB. This has been done for decades. Here is a list of most of the containers that SanDisk sells, along with their "actual" sizes. drive, you will not get full power either for the same reason. This doesn't just apply to SanDisk. Third, the speed of the card "TO" x and y when reading and writing. It depends heavily on what device you're using it on, and while these are explosive speeds, they're not designed to sustain that speed for more than a few seconds. It's really sad to see an incompetent reviewer at all when this is a really high quality product.