Why your Photos and iPhoto libraries take more space on a Mac’s external drive

The “hard link” approach Apple uses to reduce storage doesn’t survive a copy operation.
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Apple

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Glenn Fleishman’s most recent books include Take Control of Zoom, Second Edition, Take Control of Your M-Series Mac, and Take Control of Securing Your Mac. In his spare time, he makes Tiny Type Museums. He’s a senior contributor to Macworld, where he writes Mac 911.