If you are unhappy with your upgrade to Mavericks, you can eliminate any issues installing over your old software by creating a partition on your drive or external drive to install a clean version of Mavericks for testing. The base install will quickly tell you if you will see a speed difference or if issues you were seeing are a result of old files that are conflicting with Mavericks.
- Open Disk Utility in Applications/Utilities.
- Select your drive in the left window.
- Name the new partition “Mavericks HD”. See below on how to determine size.
- Apply will modify the current partition table to add the new partition.
How to determine size of partition
You could make this partition as small as 30GB, but more is better. If you have the room and plan on moving all your data to this partition, first find how much space is currently used.
In this first example, I have a 160 GB drive with approx 49 GB used. I have 110 GB available so I have plenty of room to create a partition that is equal in size and still leave some breathing room on the first partition to run OS X. (You need a minimum of 10% free.)
- Click on the drive – top name not Macintosh HD
- Click on Partition tab
- Click on + to add a second equal partition.
- Rename Partiton – Mavericks HD (It’s easy to change later if desired)
- Select Apply
Not enough free space on drive?
This next example is for users that don’t have enough free disk space to make a full restore Mavericks drive. You can install Mavericks with a little room to spare for testing some files on a 30 GB partition. Make the partition as large as possible while still leaving some room for the other drive to boot. It’s recommended that you have 10% free for the system to “breathe”.
Follow the same steps as above but this time, drag down the center bar, to resize the bottom partition. This shows a 30 GB partition.
Click on Apply to create the partition.
Download Mavericks installer from Mac App Store (MAS). If you have previously downloaded, go to Purchases tab in the MAS and select to download again.
Put your cursor over OS X Mavericks (you will see the cursor turn into a hand. Click and it will take you to the download page.
The installer can be found in the Applications folder called Install Mac OS X Mavericks. Launch the installer and select your new Mavericks partition as destination.
The next post will describe how to move over your data without using Migration.