{{  network:menu-icon-diskusage.png?direct&40}}
===== 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. 

{{network: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.

{{network:flash_benchmark.png?nolink}}