DirecTV HR20 User Manual page 168

Appendix 3: About High-Definition (High-Definition DVRs)
If your display is a 16:9 format TV or monitor, your format options include these:
For 4:3 program signals:
Pillar Box Stretch Crop
For 16:9 program signals:
Fills TV Screen
DIRECTV DVR
® USER GUIDE
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