Key for the unique identifier of the resource’s volume, returned as a
- iOS 5.0+
- macOS 10.7+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 2.0+
- Core Foundation
This identifier can be used with the
CFEqual function to determine whether two file system resources are on the same volume.
The value of this identifier is not persistent across system restarts.