Add oflag=sync to the dd command line #858
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Using only
status=progress conv=fsync
will result in a seemingly very fast copy, much faster than the write speed of the SD card, followed by a long delay as the data is actually written to the SD card.Using
status=progress conv=fsync oflag=sync
will show a slower progress, roughly matching the write speed of the SD card, but once it is done the command will complete immediately.I think the second approach is more intuitive and less likely to cause users to think the copy is hung.