Import/Transfer Video from Sony Handycam Camcorder

It has been a while since I bought my own Sony Handycam Camcorder, while it is handful when I need to record a video, problems always seems to pop up whenever I want to import/transfer video from the Sony Handycam Camcorder. Using the USB cable Sony provided will only results in bad quality video…
So, after looking around & searching in several forums, finally I found out in a forum thread that if we use the camcorder power supply & not just the camcorder battery, we can transfer import/transfer the video in high quality, problem solved!
Hmm… By reading the forum thread I knew that a lot of people are facing this problem, just wondering why Sony doesn’t tell that in their own tutorial?

[...] has been a while since I bought my own Sony Handycam Camcorder, while it is handful when I need to record a video, problems always seems to pop up whenever I want [...]
i had recorded video in my handy cam but i inserted local disc instead of sony disc it has recorded and was playing back in handycam once i removed disc and reinserted i lost all my recorded videos……
i have inserted disc in my comp and checked properties it has occupied full memory space but when i open F:/ there are no files plz help me……….if anyone can
i have bought a new computer using Vista but i can load the sony handycam software because not compatible. Now i cant transfer my video. When i use another computer to transfer again the image of the video recorded is moving not smoothly but jerking and lag. How to solve this problem