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Message: <blockquote data-quote="skybolt" data-source="post: 1657346" data-attributes="member: 30261">I did the upgrade, and will be using Photos from here forward.  I noticed that my hard drive was filling up, so I started looking.  I find that I now have a library named iPhoto Library.migratedphotolibrary that is 136 GB (I have about 16,000 pics), and one named Photos Library.photoslibrary that is 81 GB.  Why are they so big?  And do I need both?  What are the ramifications if I delete the "migrated" iPhoto library?  I also notice that I have, in the "migrated" file 54 GB in iPod Photo Cache.  I don't use an iPod any more, just my iPhone.  Do I need this file?Thanks in advance!</blockquote>