Just noticed that the PVR format on the 180 uses FAT32. Many flash drives do also. Only thing wrong is that no FAT32 file can be larger than 4GB which limits recording time. OTOH NTFS has no such limit and the 180 (haven't tried the 150) has no problem recording on and playing back from a 32 GB flash formatted NTFS.
Just recorded over 2 hours that way, unfortunately it was only 2.8GB but suspect the answer to several recording issues might be as simple as formating the drive with NTFS.
Can anyone verify ? If so please add NTFS formatting capability.