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SD Card RL-FlashFS - Power Loss?

Hello All.

We're looking into beginning development on an ARM7 based platform, and we are thinking about using an attached SD-card for storing environmental log data.

I've noted that "All files opened for writing must be closed before the memory card is removed from the socket. Otherwise, a FAT file system might be corrupted." as per the instructions on Keil's website, but my question is:

If a system has not closed files it is writing to on the SD-card using a FAT file system, and a power loss occurs, will/can the file system also be corrupted in such a case? I'm assuming yes?

any thoughts on this? is it a bad idea in general to use a FAT file system in a system that very well could expect power loss at any time?

Thank you.

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