Well, is it TRUE? Are you running out of INTERNAL storage space? You can move music, photos, docs, etc to an SD Card but you canNOT install apps on the sd card, only INTERNAL memory.
I absolutely agree this is an annoying issue especially since you didn't even "read" nor cleared the original notification. I see no reason why it spams you.
BTW make sure you keep enough internal storage anyway and make Notifications show only in their separate category.
It's not true, my device storage has 2GB free, so I don't see how that's close to almost being full. And I always make sure that I do save my media to my SD card. And thanks for that separate category suggestion, will do that now.