Hi,
I don't think a particular brand of USB drive is a key factor, as long it's big and *fast enough to hold your packs and data, and as long as the keyboard can recognise it when plugged in, you'll be fine with any size or brand.
I hope you're aware that you're limited by the size of the flash memory installed on your keyboard, how many packs you can install on it before your memory is full. There are alternative bigger size memory cards, up to 2048MB, which is double the size of the biggest that Yamaha has to offer, and it is tested and works without any issues. Search for Mutec FMC-07, I'm getting one now, currently waiting for the delivery.
*bare in mind that Tyros's on-board USB interface is only 2.0, which is fairly slow by any current standards, and this is the limiting factor in the speed that your packs and files will be transferred from/to the USB drive of your choice. So, no matter if your USB drive is 3.0 or even 3.1, it will only be able to transfer data from/to the keyboard with speed no higher than the one that the keyboard USB's interface supports.
Cheers
Valentin