wierd rom size!!

[podge]

sorry i dont think i have explained well the problem im having is that i have two files both the same size metroid zero 8.00 MB and golden sun 8.00MB but when i try to flash them both to the card the software im using shows metroid zero as being 63.75 Mbits which i understand but goldensun only appears as 0.50 Mbits which is way too small do i need to add another file to the cart to get this rom to run? thank you AXmichigan for your quick reply any more help would be great