You can force a partition to be mounted "synchronously", where writes aren't buffered in RAM and then flushed later -- every write blocks until it is written to

You can force a partition to be mounted "synchronously", where writes aren't buffered in RAM and then flushed later -- every write blocks until it is written to disk. The options are the third column in your /etc/fstab file. For example, if you had "errors=remount-ro", you'd change it to "errors=remount-ro,sync". (Or is the Raspi problem actually in hardware?)