A1 SD Bench is a free mobile app for testing sd cards performance. It determines the class of your device (depending on its actual speed) and shows its reading / writing speed in MB.
A1 SD Bench supports Internal memory, Internal/External SD cards (built-in, SD, Micro SD, SDHC and SDXC), usb sticks and even external HDD connected to a phone via USB.
4 micro sd speed tests are available for checking the speed of reading / writing: Quick, Longer, Accurate and Random I/O. You can test one or more sd cards and compare their or other memory cards results.
Benchmarking results can be compared with the characteristics of other memory cards; all charts are available through a special online service.
We suggest disabling unnecessary apps for successful and verifiable reading speed testing. At the same time, A1 SD Bench doesn't have a significant impact on Android OS functionality.