HD is, technically, an uncompressed format. HDV is compressed to 3.6mb/sec Recording in HD means that your hard drives have to spin faster to keep up with the data stream. Usually, you need a RAID array to record to disk, and play back. Also, you will not see as many realtime effects in FCP. IMovie does not support any HD codecs, only HDV. HDV records at the same data rate as regular DV, which means you can use your internal hard drives or a single external drive. HD cameras are a lot more expensive. The least expensive is the Panasonic HVX200 which costs about $6,000, plus the P2 cards (instead of video tape) regards, sb On 10/18/06 11:14 AM, "David Grant" <dgrant at iastate.edu> wrote: >> I like the Sony HC CMOS camcorders. They are HDV, not HD > > Pardon my ignorance but the what is the difference? > > DG