Review on High-Speed Transcend 32GB SDHC Class 10 UHS-1 Flash Memory Card with Up to 60MB/s Transfer Rate (TS32GSDU1) by Bruce Cavett

Like many SD cards I've tried, this card has horribly low write performance. Unlike many other SD cards I've tested, performance is just plain poor on large but random writes, and I don't see any long hangups when the load includes a combination of reads and writes. Of course, the manufacturer has placed a clear focus on the reading performance. I saw over 75 MB/s on linear reads and over 55 MB/s on large random reads. In terms of write performance, it cleans up to 13MB/s on linear and 3MB/s on large random writes (most cards I've tested can't hold 1MB/s for large random writes). Small random reads exceeded 6 MB/s. However, small random writes of less than 1MB/s were a bit disappointing, and transfer rates of just over zero with a few pending writes suggest the card can't handle multiple threads simultaneously. Copying a set of files up to 100MB per file (over 1MB per file on average) achieved a speed of about 4MB/s. All in all it's tolerable as a file storage card and it looks like it could be made into a viable camera card. if your camera has an adequate write buffer. The 32GB version of this card has significantly better write performance and doesn't get overloaded with multiple threads; I'd recommend it instead unless your device can't handle it. I haven't had any issues with data corruption or loss, but I haven't had this card in a long time.