EDIT: One more thing, there is no such thing as a Fdisk Partition. There is only GPT and MBR (Someone correct me if i'm wrong again)
Zane, i think it's a Unix (or apple) naming for MBR partitioning scheme, since fdisk is a Unix tool to edit this type of scheme.
If you do "diskutil list" on one of those you'll see:
/dev/disk1
#: TYPE NAME SIZE IDENTIFIER
0: FDisk_partition_scheme *320.1 GB disk1
There's probably a better explanation.
As for rimmi2002's problem, beats me
but yes, the commands are screwed.