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Nov 6, 2015 6:42 AM in response to Bets528by léonie,Make sure that the USB drive has the file system MAcOS Extended (Journaled).
See this link on how to format a drive: Format external drives to Mac OS Extended before using with Aperture - Apple Support
But note: Reformatting a drive will erase its content. Move all files you need to keep to a different drive, before you reformat the drive.
Once the drive has been correct formatted, drag your iPhoto Library from the Pictures folder to folder on your external drive to create a copy on that drive.