Everyone seems to be completely missing the point. He has much less space than he should with an 8 GB card.
@Baccabechoppin
You should definitely have more space than that. Due to how memory card/drive manufacturers calculate size, a 8 GB card will actually be a bit smaller (around 7.5 GB)
The emuNAND should only take up around 1 GB of space, or up to 2 GB if you have a n3DS, so you should have around 6 GB (+/- 500 MB) space left on the card. You can extend the FAT32 partition to the right with a partition manager, just as long as you don't touch the ~1GB of unallocated space at the beginning of the file system.