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Hi all, Ok, what am I doing wrong here? require ''windows/device_io'' require ''windows/handle'' require ''windows/error'' include Windows::DeviceIO include Windows::Handle include Windows::Error fh = File.open(''test.txt'') # Assume you have this handle = get_osfhandle(fh.fileno) if handle == INVALID_HANDLE_VALUE puts "get_osfhandle failed" fh.close exit end buf = 0.chr * 24 # sizeof(DISK_GEOMETRY) byt...