Both these 64gb sdxc's work great in my n900-

http://www.newegg.com/Product/Produc...irtualParent=1

http://www.newegg.com/Product/Produc...irtualParent=1

Used easus partition manager to format them fat32 with a 64kb cluster size (larger cluster size is better for flac's/videos/large files in general). Really any application that can format in fat32 at that size will work fine.

Get 20MB/s+ transfer speeds copying ~6000 music files (mp3/flacs) with a usb 3.0 card reader for both of those cards. Good enough for me.

Amazing how $50 will buy you 64gb of memory in a form factor the size of your thumbnail.

I hope we see 128gb microsd's soon, and prices under $100ea even sooner, along with compatibility with the n900.