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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. The cache will definitely affect the final reading speed and may affect writing speed. To avoid IO caching, use Accurate or Random I/O tests.
  • Some tests may not work on older Android devices due to their limited internal memory.
  • Your device needs enough free (100 MB and up, depending on media speed, and up to few GB if using Longer test option) space for benchmarks to work.
  • RAM benchmark tests only 1 CPU core. It is possible that performance scales linearly using multi-threaded approach.
  • Most likely, each of SD Bench tests will produce a different speed score. The Accurate and Random I/O benchmarks are most reliable.
  • Random I/O benchmark uses blocks of 4KB (4,096 bytes).
  • 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.
  • View additional notes about Accurate & Random I/O benchmark.
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Apr 19, 2014 · 20:43
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