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You can Partition the boot disc on OS X REAL?!!!

Posted on 2007-11-16
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Last Modified: 2013-12-01
There's a walkthrough on the Ubuntu forums that shows partitioning a booted OSX HDD.

http://ubuntuforums.org/showthread.php?t=89960

Is this real?! I thought you had to format the whole HDD.

I've personally tried to partition the partition using the walkthrough, however got stuck at the "disableJournaling" line. Darwin just prints a manpage and deons't show if it can be disabled. I can "enableJouranling." And Disk Utility has always shown under the partition tab: Mac OSX extended (Journaled).

Apps Help:

Since many of my apps were "copy this *icon* to the
apps dir," i'm confused as to how to store them on my external USB
HDD. How would one go about doing this?

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Question by:Trilokavijaya
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Eoin OSullivan earned 250 total points
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It is known that Ubuntu can read HFS+ partitions and re-partition them using the command line tool called parted.  Apple Disk Utility has a partitioning tool included but it will delete ALL partitions and therefore you lose ALL data.

The instructions provided  for Ubuntu seem to be correct but an issue may not have been very clear.
The re-partition will ONLY work if there is NO data related to the OSX system stored on the part of the drive you are partitioning off.  You can only partition FREE space and parted has NO tool to defragment and optimise a hard drive so it is not very efficient.

There are also Mac programs that will re-partition a LIVE drive
Drive Genius - http://www.prosofteng.com/products/drive_genius_info.php
iPartition - http://www.coriolis-systems.com/iPartition.php

Personally the way I would do it is to create a clone or disk image of the Macintosh HD using SuperDuper! or Carbon Copy Cloner.  Store this image on an external drive then erase, partition and reformat the hard drive. Make sure the 1st partition is big enough to store the disk image you created. Now copy the cloned image back to the smaller 1st partition using the restore options in SuperDuper or CCC.
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