4 Partitions on MBP?

[Avicenna]

What are these other two partitions that I have(bold)? I should only have 2 paritions, one for OS X and other for boot-camp.

   #:                       TYPE NAME                    SIZE           IDENTIFIER
  [B] 0:      GUID_partition_scheme                     *298.1 Gi     disk0[/B]
 [B]  1:                        EFI                                200.0 Mi     disk0s1[/B]
   2:                  Apple_HFS Macintosh HD         281.9 Gi     disk0s2
   3:       Microsoft Basic Data BOOTCAMP          15.9 Gi       disk0s3

Just curious, i was about to install snow leopard and i saw these....

 

[Hellhammer]

How big is your HD? 320GB? If it is, #1 is the HD, #2 EFI (FirmWare, important), #3 your Macintosh HD and #4 your bootcamp partition. Don't know why they show up like that though