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# kCFURLVolumeSupportsVolumeSizesKey

Key for determining whether the volume supports returning volume size information, returned as a `CFBoolean` object. If `true`, volume size information is available as values of the [`kCFURLVolumeTotalCapacityKey`](/documentation/CoreFoundation/kCFURLVolumeTotalCapacityKey) and [`kCFURLVolumeAvailableCapacityKey`](/documentation/CoreFoundation/kCFURLVolumeAvailableCapacityKey) keys.

```
let kCFURLVolumeSupportsVolumeSizesKey: CFString!
```

---

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