I have a problem on boot camp where when I try to click continue but I get this message. Can anyone help?

The startup disk does not have enough space to be partitioned.
You must have at least 40GB of free space available.

The Error Message

About this mac says this

Possible Fixes

  1. It could maybe be time machine since I have it enabled. But as you know High Sierra does not give you the time machine off switch in system preferences

  2. It could also be a disk utility partition error but you can clearly see on the image below I only have 1 partition which is my main OS hard driveI only have 1 partition

  • 1
    It says you need 40gb to proceed. Disk utility indicates that you have 35gb free. Are you able to make a total of 40gb free space and retry? Is there some other information that would be relevant?
    – Scottmeup
    Jun 4, 2018 at 5:38
  • I tried it on my mate's computer and he had 50GB but it still gave me the same error (message
    – EB R
    Jun 4, 2018 at 7:19
  • It's saying that it's not going to try until there's 40gb free. If you start there and still have problems we can look at where to move forward from there.
    – Scottmeup
    Jun 4, 2018 at 7:43

1 Answer 1


You need 40 GB of 'real' free space. The 'Available including Purgeable' figure doesn't count.

This is the one you need to be 40GB minimum...

enter image description here

Also, why not start with virtualization instead of boot camp. With that little free space, you will have run out of growth area for macOS. You might be much happier if you had 80 GB free before you decide to wall off 40 GB or more for Boot Camp since you can’t easily reclaim or change that allocation once you start down the boot camp path.

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