Notes… While SD Bench tends to provide balance between speed and accurate benchmark results, the following notes must be taken into consideration when interpreting the final score.
- Android operating system supports file / disk / IO caching. It will definitely affect the final reading speed and may affect writing speed.
- To get more accurate results, it is possible to use Longer testing option from the Settings screen. This option will not work on older Android devices due to their limited internal memory.
- RAM benchmark tests only 1 CPU core. It is possible that performance scales linearly using multi-threaded approach.
- SD Bench tests only sequential read and write performance. Most probably, random IO will yield a different score.
- NTFS and other non-native file systems is supported as far as your Android device is compatible with a such FS.
- Sometimes the same media may appear under different SD cards. For example, on Galaxy S3 "the default" SD card is mapped into phones internal memory, so SD card and internal memory refers to same media.
- And, of course, using your phone while benchmarking is not recommended.