Virtualization macOS 12.0 Beta 1 to Beta 2 API Differences

VZDiskImageStorageDeviceAttachment.h
Added VZDiskImageSynchronizationMode
Added VZDiskImageSynchronizationModeFull
Added VZDiskImageSynchronizationModeFsync
Added VZDiskImageSynchronizationModeNone
Added -[VZDiskImageStorageDeviceAttachment initWithURL:readOnly:synchronizationMode:error:]
Added VZDiskImageStorageDeviceAttachment.synchronizationMode