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There is actually a little more to it than that.
HD simply means "High Definition", which includes everything from 720i to 1080p. It is simply referring to the alternative to "Standard Definition".
HDV is an extension of the DV recording format. It is a compression scheme for recording HD video.
HDD refers to "Hard Disc Drive". Many newer camcorders are abandoning tape all together and recording to a hard drive in the camera, or solid state ("flash") memory. The caveat with these is that the video is highly compressed. It will look great straight out of the camera (assuming you shoot good video in the first place), but editing it can be a nightmare.