You can use fdisk to show what partitions exist and how they are formatted.
Here is a sample session from my system:
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root@pikachu:~# fdisk /dev/hdb
Command (m for help): p
Disk /dev/hdb: 6448 MB, 6448619520 bytes
255 heads, 63 sectors/track, 784 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/hdb1 * 1 784 6297448+ b Win95 FAT32
Command (m for help): q
root@pikachu:~#
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Based on the above output and your example, you would mount the partition using the command:
mount -t vfat /dev/hdb1 /mnt/extra
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