In case there is ever a need to format a disk with HFS or HFS+ (OS X native disk format) or NTFS in Ubuntu, you can add the following packages to your Ubuntu 9.10 system to add support for gparted:

HFS – hfsutils

HFS+ – hfsprogs

NTFS – ntfsprogs

You can install them all in one shot too:

apt-get install hfsutils hfsprogs ntfsprogs

Also, if you don’t have gparted installed, that is easy as well, just run the following:

apt-get install gparted