Disk is dirty, running fsck -y

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If this message appears when booting a new NanoBSD-based embedded image:

Disk is dirty, running fsck -y

Pull the card and try to write the image again, and make sure there were no errors.

This error can show up if the config slice (Slice 3, or /dev/ufs/cf) is missing or damaged, typically a side effect of writing an image to CF which was too large for that card.