What are the disadvantages of using uppercase 'W' in fopen compared to lowercase 'w'

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fidx = fopen(filename,'Wb');
I know from the help file that the uppercase 'W' has something to do with buffering of outputs but I have yet to find any differences between files generated using uppercase 'W' compared to lowercase 'w'. It is obvious that the uppercase 'W' is much quicker than the lowercase 'w'.
Are there any downsides to using uppercase 'W' in simple binary file creation...?

Answers (1)

Jan Orwat
Jan Orwat on 6 Jul 2016
Edited: Jan Orwat on 6 Jul 2016
I guess some memory is used for buffering purposes. There should not be any differences in written data. 'W' or 'A' are faster when writing small chunks of data repeatedly. When multiple read, write sequences called to the same file, buffer has to be flushed every iteration, so I guess this option may be slower in this scenario, but I have never tested it.
Read Loren Shure blog post and Yair Altman blog post about this topic.

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