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+===== Disk usage =====
+**Maintenance -> Disk usage** page serves to estimate occupied and free storage space on SD card, and gives a forecast for storage run out.
+{{disk_usage.png?direct}}
+There is a special SD card benchmark built in to test performance of your card. Press **SD card speed test** button to run the benchmark.
+Slow flash storage can cause performance issues. Usually we see numbers about 80 writes/second. Lower numbers will tell you that your card is slow.
+{{flash_benchmark.png?nolink}}