DVDR3545 Overwriting (Philips DVDR3545V - DVD recorder/VCR)

[qanda]This thread is about the Philips DVDR3545V - DVD recorder/VCR. Click here to see full specs[/qanda]I’m new and I read all the rules. I searched for a previous discussion on this subject but didn’t find it.

I have recorded a one hour show and a 1 minute practice test onto a DVD+RW. I want to record 2 hrs over the previous recordings. Must I erase them first and if so, how? I selected overwrite for the first hour, then put on the timer. Will it record over both titles or must I use a new disk? If so, how do I reuse the previously used DVD+RWs? I don’t want to keep copies of any of the shows I view and prefer using DVDs over VHS tapes.