Many people who use a Mac also have a need to run programs that only work in a Windows environment. While there are a few virtual machine solutions for this, you’ll get the best performance when you install Windows using Apples BootCamp software. If you’re like me, you’ll eventually find you need to alter the size of your Windows partition. Either making it smaller, or larger depending on your needs. The problem with this is, to repartition BootCamp, you need to erase the partition and start over from scratch. This means you have to reinstall Windows and all your software again.
I am going to walk you through the process of changing the partition size without having to reinstall Windows or any of your software again.
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The first thing you’ll need is a copy of Winclone. You can download it here.
Once you open the .dmg file and install Winclone to your Mac, go ahead and open it. You then want to select the BootCamp drive you are copying.
Then, you need to select a location to put the image you make. Be sure there is enough free space to hold the image. I am using an external drive connected with USB.
After selecting your destination and clicking on the OK button, Winclone will unmount your BootCamp drive and begin the process of making your image. When it is finished, click OK. We are done with Winclone for now.
Now open up BootCamp assistant, located in your Utilities folder found inside the Applications folder on your hard drive. Make sure the “Create or remove a Windows partition” is selected and click OK.
The next screen will show you that your drive will be made into one partition and warns you all the data on the Windows partition will be lost. That’s OK, though. We made a copy of it.
After it repartitions your drive, if the program closed itself, go ahead and open it again. Select the “Create or remove Windows partition” option again. Use the slider to select the new size for your BootCamp partition.
Once your drive is partitioned, you will get the “Start Windows installation” screen. Here you will want to click on the “Quit and install later” button.
After BootCamp Assistant closes, make sure the drive that contains the Winclone image file is mounted, (if you used an external drive), and open Winclone again. This time, click the “Restore” button and browse to and select the Winclone image.
The next, and final step is to select the newly resized BootCamp partition we just made.
After making your selection, click the “Restore” button. Once the process finishes, close Winclone. We’re done.
You can now restart your Mac into Windows again, and your Windows and all your programs and data will be just as you left it, only on a different sized partition.
ottermann is an Apple Certified Macintosh Technician. He has been working with and repairing Macs for 11 years. If you have any questions about your Mac you would liked answered, you can leave your question in a reply, or email him at: ottermann at smellytoast dot com.