249v17[38] is most compatible if I'm not mistaken
*Edit-
@brausm08:
Yeah, SDHC (and microSD) support would be nice. & good to know about v21...
My USB2.0 HDD (FAT32) works well except for what I mentioned in post #159 (3 up).
My brother's USB3.0 compatible HDD (FAT32) seemed to work ok too...