Fat file system - timing

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Hello,

I'm using a FAT file system (tffs) on my 192A3U device and it works fine.
The write operation of 34 bytes takes normally less than 1ms on 16MHz clock.
But from time to time it takes around 70 ms.
Do anybody knows why and where to correct / add code to get the OS (FreeRTOS) run smoothly?

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Talk about a coincidence. This thread:

https://www.avrfreaks.net/index.p...

was also resurrected this morning with the last two posts.