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Windows 10 gained support for flushing NTFS files with fdatasync() semantics. The main advantage over open_datasync (in Windows API terms FILE_FLAG_WRITE_THROUGH) is that the latter does not flush SATA drive caches. The default setting is not changed, so users have to opt in to this. Discussion: https://postgr.es/m/CA%2BhUKGJZJVO%3DiX%2Beb-PXi2_XS9ZRqnn_4URh0NUQOwt6-_51xQ%40mail.gmail.com