I'm using Datasafe x4 white there great never had any probs but im not sure they would stand up to x8 writing. There the ones below the datawrite yellow on svp's page. Seems my local shop has been really overcharging me £26.44 for 25 there £15.99 on svp. Ill see how i get on with my datasafe disks and let you know how it goes. Think i will start using the datawrite disks though they cheaper now £11.89 on svp and they seem to be working well for you. Pity my local shop doesnt stock them.
Should be getting my 107 next week now you have found the hack for it, I looked for ages but couldnt find anything.