How do I delete an existing partition?


macrumors regular
Original poster
Apr 7, 2008
I have bootcamp and parallels installed. I would like to delete my existing partition on my hard drive so I can re-install everything so it works smoothly again. I have a new MacBook Pro...

Any thoughts?

Thanks in advance!!


macrumors regular
Jun 21, 2007
I am assuming you are talking about the partition for windows. Just go into the bootcamp assistant where you created it and instead of create a new partition choose delete an existing partition!

Hope this helps :D


macrumors newbie
Dec 4, 2008
Helen, GA
I erased bootcamp asst. from my mac

Hello, I am trying to delete windows partition and have tried everything. I am running Mac OS X 10.4.10, 2.2GHz, 2 GB ram. I originally was using boot camp and then located parallels. while setting up parallels I must of deleted boot camp asst. At any rate, I was hoping on just reformatting with the install DVD that came with my mac book. Thinking things were great with a fresh start and a fresh mac, they were not because the windows partition was still there. So after further review, loaded the install DVD back in and went to Disk utilities and tried to erase from there and it wont let me do any thing.

1) loaded boot camp
2) erased boot camp and installed parallels
3) Well, I wanted my Mac back in factory form, so reformatted
4) windows partition still there
5) disk utilities wont let my do anything

1) I want my Mac to have its full hardrive 120GBs

Any help would be appreciated, thank you!


macrumors 68020
Jun 14, 2008
New Hampshire
Well it sounds like you just formatted the OSX partition. Assuming that is the case, to remove the extra partition you need to boot from your OSX installer disk (whether retail or Disk 1 of the Restore set that shipped with the computer) and run Disk Utility from the menus of the booted DVD. Booting using your hard drive and running Disk Utility there will not work.

Once in Disk Utility there, you need to click the drive (not a listed partition of it) in the left window then go into the "Partition" tab. If the "Partition" tab does not show in the top tabs, you have not made the correct selection on the left BTW.

When in the partition window, change the number of partitions from "Current" to "1 partition". Name it, make sure it is Mac OS Extended (Journaled) and click the "Options" button at the bottom to make sure it reads "GUID" in the pane that pops up.

Click "Apply" and the partition map will go back to one partition and it will be erased. Then you will be ready to reinstall OSX on that single partition which should have your full HD capacity.