I just got a Zinwell 630HD knowing that it had scheduling capability, as I want to record to an external DVD recorder (occasionally we like to cut a DVD of a program to keep longer term). But it complains and won't change channel at the appointed time if there's no disk attached. Works OK with a FAT32 flash drive but we want more storage than that. Tried two portable HDDs, one of which admittedly was NTFS, but couldn't even get it to recognise that a disk was attached, i.e. the 'format' installation option said no disk present to format. Which makes me wonder if the USB port is not supplying enough current. Anyone had any success with USB-powered portable drives with this unit, or is it going to be necessary to use an externally powered drive, e.g. a desktop drive?