Recordable space on DVD-R vs. Dual-Layer DVD+R

I have the PB 17" 1.67GHz Nov 2005 model with the DVD dual-layer burning drive.
I bought a 15 pack Memorex DVD+R DL recordable 2.4x, 8.5GB, 240min video to experiment some with this media.
On many of my DVD-R Single-Layer discs I can record data up to around 4.3 GB at a pinch. I notice that the DVD+R Dual-Layer disc will only record data up to around just under 8GB using Toast Titanium v7.0.2 in each case. Is this to be expected ? I was hoping for much closer to 8.3 GB. If the 8GB is all I can expect what is the 0.5 GB being held back for and what is this user-unusable spaced used for ?
Thanks... Barry

I have the PB 17" 1.67GHz Nov 2005 model with the DVD dual-layer burning drive MATSHITA DVD-R UJ-846.
I bought a 15 pack Memorex DVD+R DL recordable 2.4x, 8.5GB, 240min video to experiment some with this media. Toast actually reports the disc ID to be RITEK...D01 dual, opposite track path.
On many of my DVD-R Single-Layer discs I can record data up to around 4.3 GB at a pinch. I notice that the DVD+R Dual-Layer disc will only record data up to around just under 8GB using Toast Titanium v7.0.2 in each case. Is this to be expected ? I was hoping for much closer to 8.3 GB. If the 8GB is all I can expect what is the 0.5 GB being held back for and what is this user-unusable spaced used for ?
Thanks... Barry

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