Copied folder, twice the size.

I'm trying to copy a folder from one internal drive to another. It's about 170GB of video files, but ends up being over 240GB when it's copied. I went through the subfolders, some seem fine while others are twice the size. For instance a subfolder with 6GB of MP4 files, ends up being 13GB. Any ideas on why that would be?
I'm also getting the dreaded error -36 when copying to some of my external drive. Three seem to work fine, while two don't. I would think that the drives might be bad, but one was old and one was new. It was like they had infected each other.
Thanks!

rpfive wrote:
I'm trying to copy a folder from one internal drive to another. It's about 170GB of video files, but ends up being over 240GB when it's copied. I went through the subfolders, some seem fine while others are twice the size. For instance a subfolder with 6GB of MP4 files, ends up being 13GB.
I may be way off base, but if the destination drive is bigger than the source drive, what you're seeing may be explained by the size of the "allocation unit" of the drives. There is a minimum amount of disk space that even the smallest file will occupy. On my 125 GB boot volume that minimum size is 4 KB. Do a Finder "Get Info" of one of the files on the source drive and the same file on the destination drive. Compare the "Size" values of each file (not the values in parentheses).
I'm also getting the dreaded error -36 when copying to some of my external drive.
How are those external drives formatted?

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