Can't resize main partition even in G-Parted So I had an old partition that I deleted, and now moved all my stuff to the new one. Now I am out of space, and I want to resize it to fill the whole hard drive.

But Disk Utility wouldn't let me resize the partition! It is grayed out.



So...

I boot off of G-Parted Partition Editor, and sure enough, I couldn't resize the partition! I could only make it a bit smaller to the few megabytes of remaining space.

What is wrong, and is there a way to fix this?
It's greyed out because the free space is before the partition.

Try resizing using iPartition. iPartition can move partitions without data loss, which can usually get you out of sticky situations such as this.

You can modify the boot disk by making a bootable CD/DVD or installing on an external OS X installation.