Lightroom Classic: Smart Previews File Size Incorrect on Mac Finder

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  • Updated 6 months ago
  • (Edited)
I have been using Lightroom for years back to LR5.  Ive run into the issue when I merged 7 catalogs to 1.  The sum of the smart previews was roughly 95gb.  Once the merge was complete my Mac was only reporting it as 27gb despite actually being roughly 95gb as reported by Omni Disk Sweeper.  So I deleted and rebuilt the smart preview library.  after completion it reported the 95gb.  Then I went through and deleted 700+ photos.  In finder the file size did not change.  When I check the smart preview size within Lightroom it reports 90gb.  Is this a Lightroom or macOS issue?
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Michael Karchner

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Posted 6 months ago

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Johan Elzenga, Champion

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Did you restart your Mac? Because Lightroom deletes stuff outside of the Macintosh Finder, the Finder often does not show the correct size of Lightroom packages like smart previews.
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Michael Karchner

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I’ve restarted the computer, opened the catalog on multiple computers but all display the incorrect file size. Unless I rebuild the smart previews.
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Johan Elzenga, Champion

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I would simply ignore this.
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Michael Karchner

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I don't think it should be ignored as the computer is registering it as used data that is actually available.
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Johan Elzenga, Champion

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That remains to be seen. MacOS often does not report deleted data, even though it is available if and when needed.
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Jao van de Lagemaat

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You should ignore this. It is a MacOS problem. I see this all the time if I delete or create items using the command line. It takes ages for finder to become aware of the changes. If you really are worried about it, run disk first aid on the partitions on your main hard disk.