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Question: High Sierra Bootcamp Partition Problem -8gb 40gb

Hi all,

Hoping someone can help.

I am trying to install windows onto my late 2012 i7 Mac mini however I am having trouble partitioning the drive.

I am only given the option of 40gb or (bizarrely) -8gb (minus 8gb).

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Clicking Divide Equally does nothing, neither does dragging the slider. If you just 'click' on the partitions it swaps repeatedly through 40gb and -8gb.

It happens whether it's windows 7 or windows 10 installed.

I currently have a fusion drive setup as below however I have also tried splitting them into two separate drives and I've also manually created a 120gb, 500gb, 500gb partition with one of the 500gb's as FAT - no success.

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I've seen threads relating to the same thing going back several years with no fix arrived at, surely Apply have fixed this issue or don't they care about Bootcamp any longer?

Any help gratefully received.

Mac mini, macOS High Sierra (10.13.3)

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Question marked as Solved

This is a known issue with High Sierra. Sierra should not have this issue.

Are you also unable to create a FAT partition via Disk Utility?

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Mar 13, 2018 1:05 PM in response to Loner T In response to Loner T

No, I can resize my existing partition, create a FAT partition in it's place but I still only get those two options.

So if I downgrade back to Sierra you think all will be well?

Once it's all created will I be able to install high Sierra again or should I just leave it as is?

Mar 13, 2018 1:05 PM

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Mar 13, 2018 1:29 PM in response to smbudge In response to smbudge

You have a 2012 Mini, which should have three options in Bootcamp Assistant. The first two - Create and Download options - allow a USB2 flash drive installer to be created. The last option - Install - partitions the disk and reboots into the Windows installer.

Create the USB2 installer.

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Once you have the installer built, create a FAT partition manually, via Disk Utility, and you will need to create a MBR manually using GPT FDisk, and manually start the Windows installer from the USB using a reboot and Alt/Option key.

Mar 13, 2018 1:29 PM

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Mar 14, 2018 3:17 AM in response to Loner T In response to Loner T

Yeah, you lost me at GPT FDisk lol - I downgraded to Sierra and Boot Camp worked perfectly.

I should not be surprised Apple would ship faulty software and not worry about fixing it.

Really poor but it's Apple through and through now.

Mar 14, 2018 3:17 AM

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Question: High Sierra Bootcamp Partition Problem -8gb 40gb