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Extracting RAR archives results in different extracted file sizes
I have been extracting several RAR archives that have been stored on an external HD for a while. I do not know what the exact contents of the archives were before they were archived so there is no way for me to know if any content is actually missing. I started extracting two copies of each archive as a redundancy factor and I noticed something very strange. After the archive is fully extracted I extract the same archive again and once the same archive is fully extracted I view the Properties of both and the size, size on disk, and file/folder count are different. They are not massively different from each other but I question why they would be different at all as they should be identical since they are being extracted from the one and the same original RAR archive.
The RAR archives are stored on one external HD and I am extracting them to another external HD (Untitled). Both HDs are formatted as ExFAT. They are being extracted by WinRAR v5.40 64-bit on a Windows 7 Ultimate x64 Dell laptop. And this has happened with multiple archives. I have made sure in the process that nothing has gotten disconnected, the computer has stayed on the entire time, no power failures.
The part I have found to be even stranger is that when I disconnect the external HD that I have extracted the files to and connect it to my Mac and compare the Properties of the two RAR archives; they are identical in size, size on disk, and item count. Also strange to me is that the file sizes on the Mac are quite a bit different compared to the identical file on the same drive on the Windows 7 computer.
I've attached a couple screenshots of three copies of one archive extracted and two copies of another archive extracted with the Properties displayed on the Windows PC and the Mac. I just can't understand why the files when extracted are different sizes. My main purpose for this post is first to see if anyone might can tell me why the files may be different in size and second to see if anyone thinks I have a reason to be concerned about missing files. Thanks to anyone in advance!!