rewrites) Relatively short life of the laser diodes (average of about 2 years depending on usage). In addition, DVDs recorded with DVD recorders in the standard DVD format must be finalized to view in other DVD players. This disadvantage does not apply to discs recorded in the newer and more flexible DVD-VR format or the DVD+VR format - the latter (but not the former) also being compatible with DVD players. The implementation of MPEG-2 compression used on most standalone DVD recorders is required to compress the picture data in real time, producing results that may not be up to par with professionally rendered DVD video, which can take days to compress. Standard definition VCR replacement DVD video recorders typically has a set of standard recording modes for fitting 1, 2, 4, 6, 8, 10 hour modes (XP, SP, LP, EP, SLP, SEP, respectively) on single layer 12 cm discs (DVD5). These modes are comparable to those found on VHS VCRs using standard 120-tapes, having SP, LP, SLP modes of 2, 4, 6 hour. The United States converted its over-the-air television broadcasts to digital "ATSC" in June 2009. This will have a limited impact in ending the need for DVD recorders to perform realtime MPEG-2 encoding or transcoding. The only setup where ATSC could eliminate MPEG-2 encoding/transcoding in a DVD recorder would be where an antenna is hooked directly into a DVD recorder that has an integrated ATSC tuner. However, the DVD recorder will have to transcode the ATSC MPEG-2 into DVD-Video-compliant MPEG-2 if the ATSC MPEG-2 stream isn't already DVD-Video-compatible. This would require transcoding for all high-definition broadcasts and some if not all standard-definition broadcasts. The same general situation applies to digital cable service; only DVD recorders with integrated digital cable ("QAM") tuners can avoid transcoding, and then only if the digital cable system is already sending a DVD-Video-compatible MPEG-2 stream, which again requires transcoding of all HD content and some if not all SD content. All other setups (digital cable box's analog outputs to DVD recorder, satellite box's analog outputs to DVD recorder, DVD recorder tuning and recording analog cable channels which are still permitted after 2/2009, etc.) usually always involve an analog step with MPEG-2 encoding being necessary inside the DVD recorder. A number of manufacturers have combined DVD recorders with mechanical hard disk drive-based digital video recorders, allowing for recording to large fixed disks, and the ability