[CentOS] OT Question about raid 5

Hi List

I am hoping that someone here could perhaps give me a straight answer
on a question that someone asked me today

I have always belived that if you have 5 hard drives 1 50gb second
50gb third 20gb fourth 60gb firth 30gb that the largest would then be
the size of the smallest disk, not 80 or 100 or 120 for that matter or
am I wrong here?

Regards 
Per Qvindesland 
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