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# memoryBalloonDevices

The array of devices that you use to adjust the amount of memory available to the guest system.

```
var memoryBalloonDevices: [VZMemoryBalloonDevice] { get }
```

## Discussion

If you included a [`VZVirtioTraditionalMemoryBalloonDeviceConfiguration`](/documentation/Virtualization/VZVirtioTraditionalMemoryBalloonDeviceConfiguration) object in the configuration of your VM, this property contains a corresponding [`VZVirtioTraditionalMemoryBalloonDevice`](/documentation/Virtualization/VZVirtioTraditionalMemoryBalloonDevice) object. Use that object to adjust the amount of memory available to the guest operating system.

If you didn’t include a memory balloon object in your configuration, this property contains an empty array.

---

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