Question about ubiformat

[Daniel Bowen]

Let's say that I've prepared an image using mkfs.ubifs and ubinize.  Is
there any advantage, disadvantage or difference to doing ubiformat twice -
once without specifying an image file, then running it a second time with an
image file?  In other words, is there a difference between these two
sequences:

ubiformat /dev/mtd4
ubiformat /dev/mtd4 -f /mnt/source/ubi.img

and

ubiformat /dev/mtd4 -f /mnt/source/ubi.img

Thanks!
-Daniel