Images Bigger on External Drive?

This isn't really a problem; just a question. I copied some huge files from my external hard drive to the folder Documents on my MacBook Pro. Then I compared both collection of files, the original and the new copy. Both have the same number of files - 197,701. However, the original copy (on my external hard drive) takes up something like 7GB or 8GB, while the original copy takes up about half as much space.
Why is that?
Thanks.

If you "get info" on one of the files, does it have the same number of bytes on each hard drive? (The "Size" in the Get Info windows should say something like "2.19 MB (22,998,160 bytes)".) It's possible that the block sizes of the hard drives are different. This will make the minimum amount of hard drive space a file can take up different.
-Doug

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madhusudhan wrote:
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