Does “Format SD card” actually work?

Anytime I’ve tried this, I’ve had to eject the SD and then use the SanDisk utility to format the card. Does this option work on any SD cards? I don’t want to have to eject the SD card when it fills up and I want to clear it to start over.

You should only need to format the SD card if you are concerned about its format, or if you want to erase what is on the card. The oldest data on the card will be automatically overwritten if space runs out.

What device, what firmware version? what SD card (Brand, model, capacity)? what version of the app?
I’ve read of some problems w/ V3’s.