Originally Posted by T3RM1NVT0R
I doubt that you ran mkfs /dev/sdb because that will not work.
Yes, it will work. You don't need to make partitions to make a filesystem on a disk, although it is recommended.
To the OP: While the approach to use the entire disk without partitions is rather unusual there should be no problems with it, except for some programs that don't expect it to be that way. Make sure that you don't let those programs alter anything on the disk, or you may loose your data.
I personally don't like this approach, I would make a backup of that data, repartition the drive and then put a new filesystem on the partition, not the whole disk. But this is just my opinion, if it works for you then use it that way.