How to save Youtube videos while watching

THIS TRICK WORKS NOT ONLY FOR YOUTUBE VIDEOS, BUT ALSO FOR ALL VIDEOS .
WHILE PLAYING THEM U CAN SAVE THEM....
JUST DO THE FOLLOWING BEFORE YOU PLAY THE VIDEO...
c:\user\youname\appdata\local\google\chrome\userdata\Default\Cache

1. OPEN THE ABOVE FOLDER IN YOUR COMPUTER...
2. Before you play videos from any sites first open the directory.Our video file will save here.
3. Go there and see when u play video on web there will be one video with increasing file size(due to Buffering).when buffering end then copy the file without closing tabs where u buffered video.
4. Copy where u wanted.

Note:-

• It will save your bandwidth
• Make sure hidden files(control panel->Folder options->check show hidden folders) are viewable in your pc