[Avid-L2] dot file names in MXF folders

I hadn't ever noticed before because I'm on a mac, and macs treat files that
start with a . as invisible...
It seems like every time the title tool renders media, the file it creates
starts with a dot (.).
What this means, is that when I copy media (via the finder in mac) from one
drive to another - I end up not getting all of the media and have to do a
lot of re-rendering of effects in the timeline. (I just figured this was
'normal' behavior)
I didn't notice these dot files until I happened to be browsing the
filesystem with a java program that doesn't ignore them.
Lo and behold, when I copied them across I didn't have to do anywhere near
the amount of re-rendering that is usually required!

Does this happen to everyone? Or do I have a setting set up funky in MC?

Makes me wonder if I should use the command:
'sudo defaults write com.apple.Finder AppleShowAllFiles YES'
just so that I can get a proper archive when I copy media between drives.

Or am I off base here, and these dot files are not important? (except they
seem quite large so they can't just be useless, can they?)

Thanks.
Jeff

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