I am writing Raspi images on flash card with the following command

dd bs=4M if=image.img of=/dev/sdf conv=fsync status=progress

and it displays progress

5662310400 bytes (5,7 GB, 5,3 GiB) copied, 25 s, 226 MB/s

unfortunately, it does full progres in few seconds, while real writing continues several minutes after this. This is evident because dd doesn't exit and flash readed LED blinks.

How to make it to display actual progress and/or disable any caching during dd?



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