Unable to install bootcamp as I cannot partition my HD

Question

Unable to install bootcamp as I cannot partition my HD

I am trying to install Bootcamp on my iMac that has a 3TB fusion drive. When installing Bootcamp it fails as it says it is unable to partition my HD. I have followed the instructions on Apple's help pages. I am trying to sort the partitioning on my HD in Disk Utility. It is listed as Fusion Drive>Container Disk2>and under that I have Macintosh HD (11.16GB used) and Macintosh HD Data(1.16TB used) In the top right of both of these it says 3.12TB, shared by 5 volumes.

These are both clearly the same physical drive. When I try to remove there space from Macintosh HD - Data it seems to think the HD is 6tb, which it isn't.

When I click on Free Space and then the "-" button, this is what shows up:

What do I don now, as if I press Apply, it then asks me to partition and then fails. Any help would be gratefully received.

Thanks

iMac Line (2012 and Later)

Posted on Jun 20, 2020 10:21 AM

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Answer 1

Top-ranking reply

Loner T

Level 9

59,513 points

Jun 20, 2020 11:13 AM in response to theglovebox73

Disconnect the G-Drive.
Eject the disk3 image.
Your APFS Fusion drive seems to be fine. We can check for corruption, if you want.
Disconnect all external peripherals, except Keyboard/Mouse/Trackpad.
Run
- How to reset the SMC of your Mac - Apple Support
- Reset NVRAM or PRAM on your Mac - Apple Support
Run BC Assistant and try to install Windows.

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Answer 2

Loner T

Level 9

59,513 points

Jun 20, 2020 10:53 AM in response to theglovebox73

What is the year/model of your Mac (do not post the serial number)?
Also, see
- If you see the alert 'Installation cannot proceed with Boot Camp configured' - Apple Support
- About the read-only system volume in macOS Catalina - Apple Support
I do not recommend manipulating partitions/volumes using Disk Utility, unless absolutely necessary.
Post the output of
- diskutil list
- from macOS Terminal.

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Answer 3

Jun 20, 2020 11:01 AM in response to Loner T

Many thanks for your response. My Mac is an iMac Retina 5K 27 inch, 2017. 4.2GHz Quad core i7.

Output from diskutil list is as follows:

The default interactive shell is now zsh.

To update your account to use zsh, please run `chsh -s /bin/zsh`.

For more details, please visit https://support.apple.com/kb/HT208050.

Daves-iMac:~ dave$ diskutil list

/dev/disk0 (internal, physical):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *3.0 TB disk0

1: EFI EFI 209.7 MB disk0s1

2: Apple_APFS Container disk2 3.0 TB disk0s2

/dev/disk1 (internal, physical):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *121.3 GB disk1

1: EFI EFI 314.6 MB disk1s1

2: Apple_APFS Container disk2 121.0 GB disk1s2

/dev/disk2 (synthesized):

#: TYPE NAME SIZE IDENTIFIER

0: APFS Container Scheme - +3.1 TB disk2

Physical Stores disk1s2, disk0s2

1: APFS Volume Macintosh HD - Data 1.2 TB disk2s1

2: APFS Volume Preboot 82.1 MB disk2s2

3: APFS Volume Recovery 528.5 MB disk2s3

4: APFS Volume VM 2.1 GB disk2s4

5: APFS Volume Macintosh HD 11.2 GB disk2s5

/dev/disk3 (disk image):

#: TYPE NAME SIZE IDENTIFIER

0: CCCOMA_X64FRE_EN-US... +5.3 GB disk3

/dev/disk5 (external, physical):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *4.0 TB disk5

1: EFI EFI 209.7 MB disk5s1

2: Apple_HFS G-DRIVE with Thunder... 4.0 TB disk5s2

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Answer 4

Jun 21, 2020 1:05 AM in response to Loner T

Thanks. Not sure which bit solved it but now all working - thanks

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Answer 5

Loner T

Level 9

59,513 points

Jun 21, 2020 9:13 AM in response to theglovebox73

Excellent!

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Unable to install bootcamp as I cannot partition my HD

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