If you store your iPhoto library on a volume that is formatted as FAT32 (a file system commonly used on Windows PCs), you may encounter issues including poor performance or data loss. Referenced images stored on FAT32 volumes may also sporadically go offline. Additionally, storing the iPhoto library on a network rather than locally on your computer can also lead to poor performance or data loss.
iPhoto libraries should be stored on a locally mounted Mac OS X Extended drive for best performance.
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