File size duplication or . . .

If I have some photo files in my system that total 100MB in size and import them into Lightroom are they "duplicated" on my system? That is, would my hard drive be "used up" to the tune of 200MB . . . or still be filled with only 100MB of space used? Hope the question is clear . . .
Wendell

Not really. Importing leaves them where they are, unless you specifically ask them to be copied somewhere else. It does, however, create previews which tend to be in the neighborhood of 1/4 - 1/3 of the size of the images, depending on various factors.

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