(By default) Mac OS X uses GPT-partitioning instead of MSDOS-
partitioning.  I think fdisk doesn't know about GPT partitioning and
thus only sees the MSDOS compatibility MBR that GPT includes.  If you
want to wipe the disk completely, you can write a new "disk label"
(partitioning format) to the disk (this option is in the Device menu).

To find what might cause your problem, can you please attach the output of the 
following two commands (before writing the new partition table!):
sudo parted /dev/sdb print
sudo fdisk -l /dev/sdb

** Changed in: gparted (Ubuntu)
       Status: New => Incomplete

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gparted cannot get rid of 30kb head partition of an HSF disk formated in Mac OS 
X
https://bugs.launchpad.net/bugs/381352
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