I wonder why Sony hasn't included the option to record to DSD format in the D50 and new PCM-M10? Sony themselves developed the DSD audio format, so you'd think they'd support the format in their own portable field recorders. My Sony PS3 supports playback of DSD audio discs and the VAIO notebook I bought two summers ago includes apps for recording and playback of DSD discs, so it's not like Sony gave up on the format. I currently use the Korg MR-1 and have been waiting for Korg to come out with a new model with improved battery life and replaces the internal hard drive with flash memory. If the new Sony PCM-M10 supported DSD format I'd be all over it.