Welcome to the forum keepithd, sorry for the late respond.

Recorded programs from HD DVR are usually in MPEG-2 format and if you can grab that into your PC you can use a software to "convert" it to Blu-ray, DVD, WMV, AVI, DIVX etc, then you can burn it to Blu-ray disc or DVD disc.

DVD blank disc is just a medium, similar to Blu-ray blank disc so you if the converted content fits in a DVD, you can burn your hidef content to DVD. However watching a blu-ray content in a DVD disc is a different story, you can not watch blu-ray content in dvd on your standalone dvd player but you can watch it on your PC's DVD reader/burner if you have the right playback software for example PowerDVD Ultra.