I recently acquired a 64GB USB flash drive (Kingston USB 2.0 Data Traveler micro). The drive originally came formatted in FAT32. It worked fine on my 2013 Nexus 7 (stock rooted) with Chainfire's Stickmount app, but not on my Verizon DE moto x (stock rooted). Basically, the x won't recognize that a drive is attached at all and it won't mount. I tried reformatting the flash drive in NTFS and exFAT, but still wouldn't work moto x. I have a 2GB flash drive that works just fine on the moto x in FAT, FAT32, and NTFS, so I know the moto x will read drives in those formats.
I was wondering if the problems I'm having with the 64GB drive on the moto x have to do with the storage size or if it's something else with this particular brand/model flash drive. Before I buy another 64GB drive I was wondering if anyone else has had similar problems or successes in getting a 64GB flash drive to work with the moto x.