The controller chip is programmed to report a massive capacity to the OS. But physically, there might only be 8GB of cheap, recycled NAND flash inside. When you try to write past 8GB, the data just wraps around and corrupts the beginning of the drive.
: Detailed performance benchmarks from various users are available on the NirSoft USB Speed Test database Hardware Database : View technical details on DeviceHunt Firmware Information usb device id vid 14cd pid 1212 link
(like "device not recognized") with this reader that I can help you troubleshoot? The controller chip is programmed to report a