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I have been using airdrop to transfere a ~100GB Aperture library from one Mac to another. After ~10h of copying, the file on the destination Mac was only 20GB of size. I was able to open the Aperture library, but a lot of master files were missing.

The strange thing is Activity Monitor showed that all ~100GB of data were transfered, but at some point the files just got lost.

Any ideas what may have gone wrong?

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AirDrop is not the recommended way of transferring 100GB. It does so at speeds of max 10MB/s. –  duci9y Sep 30 '12 at 12:24
    
I unfortunately had no other option at the time. As said in the question, it took about 10 hours. Even more it is frustrating that the file was not copied correctly. –  wowpatrick Sep 30 '12 at 13:50
    
It will never copy correctly. AirDrop is just not that reliable or fast. Theoretically, it would take about 20 hours to copy that file. –  duci9y Sep 30 '12 at 16:25
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