I can't erase old library?

Is the duplication of the old library system, I can erase (to save HARD disk space)?

Thank you

Photos will create a new library, but the old iPhoto Library and photo library are brewed very efficiently by using hard links. The original Master of the files and previews are stored in the same blocks on the disk, so the storage will not increase much.

See: Photo stops disk space to share images with your iPhoto or Aperture - Apple Support libraries

You can delete the iPhoto library, but it will not free storage as long as the same photos are also Photos.  I would wait until you have checked if the migration went well and keep a backup copy of the original library.

Tags: Mac OS & System Software

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