Write Metadata Table to Disk

VixDiskLib_WriteMetadata() updates virtual disk metadata with the given key-value pair. If the key-value pair is new, it gets added. If the key already exists, its value is updated. A key can be zeroed but not deleted.

vixError = VixDiskLib_WriteMetadata(disk.Handle(), appGlobals.metaKey, appGlobals.metaVal);