When I first got my Samsung Galaxy Note 3, back in December, 2013, I bought a Class 10 Samsung 64 GB Micro SDHC card. It worked with my iBook G4, so I put some files on the card. But when I put the card in my smartphone, the Note 3 would not read the card. So, I formatted the card in the Note 3, then connected it to my iBook via card reader, but my iBook would not read the card!
I tried initializing on the iBook with several different formats, but the card was only compatible one way.
So, I bought a cheap Generic 64 GB Micro SDHC card, which works both ways! I can load files directly from my iBook G4 via the card reader, then put the card back into my Note 3, and read all the files. I just don't like having to remove the case from the phone so many times, load the card in the reader, then load files from the iBook, then remove card from reader, replace back in the phone, then go through this process many times ......
So, I've been using Dropbox to transfer files back and forth, which works. When I get my MacPro desktop working again, I'm sure I will be able to sync the Note 3 and Mac just fine, but that will be awhile longer ......
BTW .... I decided to keep the Samsung Class 10 64 GB Micro SDHC card, for backing up files from my iBook.