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I'm unable to install Windows 8.1 using Bootcamp on my 2015 MacBook Air. The installer says setup was unable to use the existing partition because the system volumes doesn't contain the required free space.

I had allocated 100 GB to the Windows partition. Is this not sufficient?

Screen shot of installer error

  • How can I free space on system efi partition as it shows only 2 my free – aditya sharma Aug 26 '15 at 18:49
  • You made my day – aditya sharma Aug 27 '15 at 5:25
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To free up space in your EFI partition, you would have to first mount it. This can be done using the command given below. Enter the command in a Terminal application windows.

diskutil  mount  /dev/disk0s1

Below is an image of the entire contents of my EFI partition. I assume you can delete any folder and/or file other than what is shown below. (Actually, I am not even sure the Firmware.scap file is needed. I do not know what it is for.)

Click on image for a better view. enter image description here

When finished, you may need to empty the trash. Finally, enter the command below to unmount the EFI partition.

diskutuil  unmount  /dev/disk0s1

If you are doing BIOS/MBR install, then what is posted below applies

From reading other posts, I thought 2015 Macs can no longer be installed in BIOS/MBR mode. So this would apply to older Macs.

To change the system partition to partition 4, you need to run the following commands in a Terminal Application window. You need to do this before attempting to install Windows.

INPUT=$(printf  "f  4\nw\ny\nq")
sudo  fdisk  -e  /dev/disk0  <<<"$INPUT"

This will require your login password. This is normal.

  • How can I free space on system efi partition as it shows only 2 my free – aditya sharma Aug 26 '15 at 18:48
  • @aditya: I updated my answer. – David Anderson Aug 26 '15 at 20:49
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I had the same problem. You just need to reformat it again even though it shows 100% empty, just click format.

  • How can I free space on system efi partition as it shows only 2 my free – aditya sharma Aug 26 '15 at 18:48
  • Dont format anything else, just the drive that you made in Bootcamp. – emotality Aug 27 '15 at 20:46

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