Just for the heck of it, I tried my 8GB pro duo card in the D50. In the D1, the 8GB card only showed about 1 hr 45 minutes of record time at 24/96 (while a 4GB card shows 1 hour 57 minutes), but the D50 shows almost 4 hours, even though this is not an "HG" version of the memory stick pro duo. I ran it twice, first time it shut down after an hour and half when I pushed the "display" button, the second time I just let it run and got four files, 3 of them 2.1 GB and the last 1.575 GB, I am transferring to my computer now but this looks like good news for the HG version, even if the non-HG version runs a bit flaky it CAN do four hours with seamless splits.
Jeff