I've had the 765 for about five years now, I've had a great time with it until recently when I realized that some discs no longer work in my machine. Memorex, Sony, & TDK discs all used to work fine, but now I only have luck with the TDK discs.
What I've noticed with the newer Memorex & Sony discs is that the "32X" is now "48X", whereas the TDK's are still listed as "32X". It looks as if Memorex & Sony have "upgraded" their discs, but in reality it has caused their brands to not be workable in older models of the Philips 765. Maybe some of the later models of the machine will take the 48X discs, but mine won't. I just hope that TDK never "upgrades" to the higher number. I've had two other friends with the same result as me- TDK 32X work fine, the others don't anymore since switching to 48X. One friend still had some Memorex 32X discs from an old purchase- they still worked fine, but they aren't available in stores anymore.
Luckily, the TDK discs cost just a fraction more than the Memorex discs, and are about the same price as the Sony discs. This is at Best Buy, Target, & Circuit City.
This is Planned Obsolescence at its worst. The machine still works fine, the software is causing it to be obsolete. I've called, emailed, & been on realtime online chats with Philips & Memorex reps, nobody gave me a satisfying answer. They don't seem to understand the gravity of the situation, and really don't seem to care anyway.
I guess I'd just like to let the people out there know that if you have a Philips 765 machine, and it recently stopped "working" in regards to recording, try the TDK 32X discs. It is sad that a lot of working Philips 765 Machines will end up on the junk heap, too bad these large corporations (Philips, Memorex) have no way of communicating to their customers this fact that the machines are not broken. They just expect the public to buy new machines. At least they could tell the authorized repair companies this fact- my local company Fast Trak knew nothing about this. How wasteful.