Is it normal that the flash Memory (storage) rises every time I open a File or boot a program?? I just bought a Mac Book Pro 15"

My computer has 500 GB of capacity, but I have seen that every time I open a file or boot something the memory used rises a little. Is this normal? It is the first time that I have seen. 

I think that you have concerns that do not warrant much attention.  These two images were made at the same time and note the differences (in red):
(These minor differences can be attributed to background processing by the OSX which you should not obsess about.)
francaball wrote:
Is it normal to have 499,42 and have a disc of 500,28
Yes.  See mine in purple and how it compares to the red.
Ciao.

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