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Hi alee1730,
Unfortunately there is no way I have found to remove these notifications, apart from transferring the data on to an SD card for better performance.
This has been asked before,please use the search button:
/t5/Xperia-Z-ZL-ZR/How-do-I-disable-the-notification-quot-Transfer-data-to-SD-card/m-p/968450#M56866
No problem,solutions are most of the time similar if not the same.