Review on KEXIN 64GB Micro SD Card Class 10, U3, MicroSDXC UHS-I C10 - High Speed Memory Card (3 Pack) by Gary Lucas

I don't know what's wrong with these memory cards but they are unreliable in my application. It might be fine on a tablet or phone, but I've tried all three with a Raspberry Pi with disappointing results. In short, data gets corrupted almost every time you turn off and on raspberian os. This was determined using 3 different card brands (Sandisk, Samsung and Kexin) with the same shutdown sequence and operating system. Kexin was the only brand that had a corrupted data phenomenon that caused the operating system not to boot. Knowing this, I wouldn't dare to keep the original content, which is used for example in the camera to take photos, because the data can be corrupted.