VM won't recognise new disk size after resizing in Settings

[Maymone]

I create a VM by dragging the macOS Catalina Install App onto the new VM window. The default disk size is 40 GB. Before running the VM I click to customise it, and resize the disk to 60 or 80 GB. When the installing begins, it only recognises 42 GB. When I let it install the system and resize the disk afterwards, it also won't recognise the new size. It keeps showing me 42 GB, however I resize the virtual disk.

• I'm running a MacBook Pro, with macOS Catalina on it.
• I have tried both Fusion 11.5.6 and the most recent Tech Preview, to no avail.

Can anyone help?

Thanks

Tiago

[wila · Accepted solution]

Hi,

You also need to change the size of the disk via Disk Utility in the guest OS.

See this post for more details:

Mismatch in hard drive sizes

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Wil

[Maymone]

Thanks a lot, that worked!

TM

[siggi90]

I have a virtual machine with Windows 10 and i've resized the disk in the virtual machine settings from 60 gb to 150 gb but the hard drive doesn't resize in the Windows 10 virtual machine.

[scott28tt]

The hard drive doesn’t resize or the partition doesn’t resize?

[siggi90]

The partition.

[wila]

You need to manually resize the partition in your guest.

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Wil

[siggi90]

The "Extend Volume" option is grayed out, and i seem to be only able to create a new partition. My only options seem to be "shrink volume" and create "new simple volume". 

[wila]

screenshot?

[siggi90]

Here is a screenshot.

[a_p_]

Windows only supports resizing a partition with adjacent free disk space.
In your case there's a Recovery partition which either needs to be moved to the end of the disk (using a partitioning tool), or deleted in case you don't need it. If you think of deleting the partition, make sure that you create a snapshot prior to doing this, so that you can revert to the VM's current state in case it's necessary.

André

[siggi90]

Thanks. That worked.

[wila]

Hi,

Yes like André said, removing de recovery partition is the way to go (and seems it already helped resolving your issue)

FWIW, my opinion on this is that a recovery partition is fairly useless on a VM, it is much easier for a virtual machine to make backups and safeguard your VM that way.
You can also boot from .iso disk in case you need to do repairs.
It's a useful feature on a physical host, less useful on a vm.

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Wil

[ColoradoMarmot]

hadn't thought of it that way, but you're right.  Just got myself another gig back 🙂