Cache can only mask performance. It can't mask fraudulent reporting of storage capacity. At worst, the test above will return (size of write cache + size of act

Cache can only mask performance. It can't mask fraudulent reporting of storage capacity. At worst, the test above will return (size of write cache + size of actual storage), but a bargain-bin flash drive is going to have a very small (if any) write cache, so it's not going to overestimate by much.