FCP X Error: Unable to save new library or access existing libraries on late 2015 iMac

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FCP X Error: Unable to save new library or access existing libraries on late 2015 iMac

FCP X Error: The storage location for one or more libraries is no longer available. The libraries will be closed so that no work is lost.

I suddenly got this error and am a bit lost. I have been using FCP for years in my late 2015 imac (Version 12.7.6) with no problems. I have checked that FCP has Full Disk Access. Also I cannot create a new library. When I try I get this error; Failed to save. Unknown store type, format, or version.

I can open the library but the second I try to change it I get the first error. Any help?

[Re-Titled by Moderator]

iMac 21.5″, macOS 12.7

Posted on Feb 4, 2026 8:58 AM

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Answer 1

Feb 4, 2026 10:33 AM in response to rossini258

Thank you for the reply.

Since it is on the internal drive, the question about drive formatting is moot.

Letting your drive fall to very low free space probably caused some data corruption.

Furthermore, a Fusion Drive was a trick that Apple created to bridge the gap between largish but slow HD and small but much faster SSD. It is composed of two drives that appear as one to the user. Sometimes, the underlying structure that makes a Fusion Drive work as such can get corrupted.

I would first of all make sure to have a good backup.

Then I would run Disk Utility from Recovery Mode and do a First Aid run on the Fusion Drive, and if it can repair it, in case it shows errors (which it probably will).

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Answer 2

Feb 4, 2026 9:04 AM in response to rossini258

Where are the libraries stored? How is the drive formatted, and how much free space does it have?

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Answer 3

rossini258 Author

Level 1

4 points

Feb 4, 2026 9:29 AM in response to Luis Sequeira1

The libraries are in /Users/Rossi/Movies (I am Rossi and the only user) on my Macintosh HD. I was very low on memory when I first got the error so deleted a lot of stuff since I thought that was the problem. Now I have 431 GB free. I have no idea how the drive is formatted. It is just internal storage. It is a fusion drive though I recall.

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FCP X Error: Unable to save new library or access existing libraries on late 2015 iMac

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