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Helpful answers
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Apr 27, 2015 8:55 AM in response to wauawby Barney-15E,In my experience, Photos creates its new library in the same location as the iPhoto library and copies the files into its new library. Perhaps it cannot write to the NTFS disk.
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Apr 27, 2015 12:06 PM in response to wauawby Terence Devlin,You've been fortunate that iPhoto worked off that disk. In fact only very late iPhoto versions checked the disk format. But both iPhoto and Photos need the library on a disk formatted Mac OS Extended (Journaled).
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Apr 28, 2015 11:50 AM in response to wauawby Clem,Yes, NTFS is not supported.
See this online article: If Photos can't upgrade your library because it's on an unsupported disk volume - Apple Support