Lightroom CC migration from USB disk requires space on main drive

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  • Updated 5 months ago
I've been going through a lot of burning hoops to migrate my old LR5 catalog to Lightroom CC and I believe there is a bug in the migration.

Here's an outline of what I've done so far:


* Used to have LR5 catalog on a NAS drive

* CC refused to migrate said catalog because it was too old

* Installed Classic trial version and tried to upgrade catalog

* Classic refused to migrate since catalog was on a network drive

* Copied catalog to a USB drive (of course there were corrupt files which threw off Finder)

* Finally started CC, stated migration

* CC refused to migrate because there were too little disk space available

* After realizing I won't be able to free up enough space (have 128GB Macbook Pro) I see it's possible to change location in CC to a custom location. Set this to a new folder on the same USB drive as before.


So, the problem now is that CC starts migrating and then fails saying "Not enough space on main volume" - but I asked it to use an external disk.

Below is a screenshot of my Lightroom CC settings. Notice that the top paragraph mentions space on "Disken" (my internal disk) and below it says the location in use is "File Disk" (my USB drive).

Photo of Ricco Førgaard

Ricco Førgaard

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  • frustrated

Posted 5 months ago

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Photo of Norm


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I have the same problem. It seems that Lightroom CC requires the internal Mac HD (128gb SSD)
for smart previews. Even when I limit the available disk space to 5% it still is using 40gb of my 128gb drive. Useless to me as it is. This preferences page is confusing, at best, or just doesnt work.
Photo of charles.krasic


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Same or related problem on windows 10.  Lightroom CC will not install to any drive other than C: no matter what preferences I set, including windows 10 storage preferences.