I bought some Memorex DVD-R and DVD+R (each £15.00 for 10) when I first got a DVD writer, the +R never worked, whether I wanted to copy a film or save a file! The DVD-R's were much better, but still not brillient when backing up my existing DVD movies. Then looked on the web and found ebuyer recommending Datasafe 4x DVD-R (. 25 @ £5.49 + P&P. They have been fantastic. Not a single failure out of first 20 I have used, and have worked in my old DVD player, which is not DVD-R compatible! Something to do with the Ritek G04 Dye used. Whatever the techie stuff, can't recommend these enough.