I'm trying to install Windows 10 on my Mac pro using Boot Camp Assistant, but I keep getting the same error that says "The startup disk does not have enough space to be partitioned". It also says "You must have at least 42 GB of free space available", which is weird cause I have 76 GB available storage.

My Time machine is switched off and I have also tried sudo tmutil thinlocalsnapshots / 999999999999 in terminal, restarting my computer, but it is still not working. I would really appreciate if someone can help.

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Mac Pro, macOS 10.15

Posted on Mar 20, 2020 7:12 PM


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User profile for user: Loner T
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Answer: A:
Answer: A:

This looks clean. Use Disk Utility and try to create a FAT partition (not an APFS volume) of the size you want Windows to be. Expand the Details section and post the output. See Partition a physical disk in Disk Utility on Mac - allisonbrookephotography.com Support for reference.


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Posted on Mar 20, 2020 8:02 PM


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User profile for user: BobTheFisherman
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Mar 20, 2020 7:15 PM in response to maeyoshi In response to maeyoshi


You don't have enough space. There is only ine thing to do, create more space. I recommend at least 256GB for the Boot Camp partition.


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Mar 20, 2020 7:15 PM


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Mar 20, 2020 7:16 PM in response to BobTheFisherman In response to BobTheFisherman


BCA says "You must have at least 42 GB of free space available."

So, 76GB should be enough.


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Mar 20, 2020 7:16 PM


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Mar 20, 2020 7:43 PM in response to maeyoshi In response to maeyoshi


What you see is Free Space within the APFS Container. This is not the same as space that can be made available to a Windows partition.

To check the minimum size macOS can have, post the output of

diskutil apfs resizeContainer disk0s2 limits

from macOS Terminal.


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Mar 20, 2020 7:43 PM


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Mar 20, 2020 7:46 PM in response to Loner T In response to Loner T


OK, thank you.

Here is the output.

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Mar 20, 2020 7:46 PM


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Mar 20, 2020 7:56 PM in response to maeyoshi In response to maeyoshi


Can you post the output of

sudo fsck_apfs -n -l /dev/rdisk1


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Mar 20, 2020 7:56 PM


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Mar 20, 2020 7:59 PM in response to Loner T In response to Loner T


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Mar 20, 2020 7:59 PM


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Mar 20, 2020 8:01 PM in response to maeyoshi In response to maeyoshi


maeyoshi wrote:BCA says "You must have at least 42 GB of free space available." So, 76GB should be enough.

Are you not planning on doing anything with Windows other than installing it?


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Mar 20, 2020 8:01 PM


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Mar 20, 2020 8:02 PM in response to maeyoshi In response to maeyoshi


This looks clean. Use Disk Utility and try to create a FAT partition (not an APFS volume) of the size you want Windows to be. Expand the Details section and post the output. See Partition a physical disk in Disk Utility on Mac - allisonbrookephotography.com Support for reference.


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Mar 20, 2020 8:02 PM


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Mar 20, 2020 8:03 PM in response to BobTheFisherman In response to BobTheFisherman


No, I just want to install Windows 10.


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Mar 20, 2020 8:03 PM


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Mar 20, 2020 8:06 PM in response to maeyoshi In response to maeyoshi


maeyoshi wrote:No, I just want to install Windows 10.

Sorry, I did not understand. I assumed you would want to install some Windows programs, create data, or perform some other Windows tasks. You also need room for swap memory and temp files.

See more: Lindsay Lohan Merlin Monroe, Lindsay Lohan Will Die Like Marilyn Monroe


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Mar 20, 2020 8:06 PM


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Mar 20, 2020 8:45 PM in response to Loner T In response to Loner T


I created a FAT partition. I chose FAT32 but realized later that exFAT might have been better?

Also, where can I find the detail section?

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Mar 20, 2020 8:45 PM


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Mar 20, 2020 9:14 PM in response to maeyoshi In response to maeyoshi


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Mar 20, 2020 9:14 PM


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Mar 21, 2020 4:02 AM in response to Loner T In response to Loner T


When I create a FAT partition, which hard drive should I select for it?

allisonbrookephotography.com SSD, Container disk, or Macintosh HD or Macintosh HD - Data?

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Also, which format should I use for the partition?


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Mar 21, 2020 4:02 AM


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Mar 21, 2020 5:28 AM in response to Loner T In response to Loner T


Somehow, Boot camp started working before I create a partition. Then I was able to install Windows10 on my mac.

Thank you so much!


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Mar 21, 2020 5:28 AM


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Mar 21, 2020 6:34 AM in response to maeyoshi In response to maeyoshi


Excellent! Normally you create the test partition on the outermost disk entity, which is the allisonbrookephotography.com SM0256 disk.


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Mar 21, 2020 6:34 AM


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