Why did finder change some modification dates when making a copy?

I just copied a very large number of files using Finder and I discovered that some modification dates were changed. For me this wasn't a problem, but it's strange and I don't understand why it happened. I wonder if anyone else has seen a similar behavior. Here are the details:
I have a Mac Pro running under OSX 10.7.4 with 15 GB of RAM and 7 hard disks. The disks details are as follows:
Internal 1 is 500 GB and came with the computer. It is my boot drive and has a variety of material. It's about 75% full.
Internal 2 is 1 TB. It has OSX 10.6.8 on it for use as a repair disk if I need to run TechTools against my main drive or if I need to run SpringCleaning. It is about 85% full and contains mainly videos of one type or another.
Internal 3 is 2 TB. It is 98% full and contains mostly .jpg files. This drive has a single root folder with 3-4 levels of subfolders. Some subfolders have as many as 5000 folders in them. The bottom level folders each have anywhere from 20 to 300 files.
Internal 4 is 3 TB. It was purchased last week because drives 2 and 3 are getting full. My intent is to copy drive 3 to 4, then copy the data from 2 to 3. I'll probably retire 2 since my SMART checks are showing problems.
External 1 is 3 TB and is used only for Time Machine to backup internal 1.
External 2 is 4 TB and is used to backup Internal 2 and 3 using ChronoSync. I'll be changing this to 3 and 4 soon.
4 days ago I installed drive 4 and used Finder to copy the root folder from drive 3 to 4. That took about a day. I then ran ChronoSync in Trial Sync mode to see if everything was OK. (Perhaps I shold have used ChronSync to make the transfer.) I discovered that about 8,000 files had discrepancies. I wrote a simple AppleScript to identify any meta data differences between the files on the two drives. It's been running for about 12 hours and I suspect it will take more than a day to finish. So far all that script has found are modification date differences. I've examined about a dozen of the files and they look OK.
Anyone seen anything like this? Any ideas what happened? I have three user accounts on this Mac Pro. The copy was made in one account with nothing else running, but I was doing a variety of work in another account. The third account was not active.
I just did a better search of this forum and discovered a similar case from 2010.

I just found the following in another thread:
Actually yes. In my case it was my antivirus McAfee doing it. If I copied the files after disabling it, the file dates were preserved.
BTW if only few files are copied, this problem does not arise.
YMMV.
--neeraj00
Since I have McAfee installed on my Mac Pro I suspect that was the cause.

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Why did finder change some modification dates when making a copy?

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