+VR was introduced by Philips for use on DVD+RW. The idea was to maintain compatibility with the DVD Video format so it could be played elsewhere, but try and introduce some features as found in the VR mode used on DVD-RW/DVD-RAM. DVD+RW normally uses this mode in set-top recorders. It doesn't need a separate finalise step to play in other DVD recorders; finalisation is just done in the background, which makes it bit easier to use (i.e. you can't forget to do it), but it does put extra wear on the disc, as the same area of the disc is updated every time it is used. Due to DVD-Video not being able to take advantage of defect management and the extra overhead of background finalising after each edit or recording, the +VR mode has always been the least reliable, and the editing features may be missing on some DVD recorders to make it more robust.