Dual layered DVD's are accessed from the same side (i.e. you don't need to turn it over) - the laser just "refocuses" on each layer. Yes, this will give you extra record time; but make sure your DVD Burner can cope with dual-layer recording
Senile - either. DVD-R has a less robust file system so if you are looking at lots of jpeg pics then maybe DVD+R would be best. My DVD recorder is DVD+/-R and will also do Dual Layer. I can therefore use either type of blank. The price of blanks are much the same for + and - formats. Look at buying in bulk from an e-seller to get really good prices (ie 100 blanks for £25) click here for an example.
Thanks for you help, 'dms05'. The DVD recorder in my PC is both '+' & '-' and is multi layer. However, what I am looking for now is a recorder that slips under the TV set. In the Amazon site you so kindly provided, there is a 'Lite-On LVW-5115GHC' which might fill the bill.
Have you any wisdom to offer?? I am not familiar with 'Lite-on' products. Many thanks.
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