I have a SONY Windows ME and a SONY DVD Burner Model DRX-510UL. But
Everytime I copy my DVD's, it doesn't fit in my blank media (4.7 gb)
Can you tell what to do? Step by step if possible. Thank you.

Hello marlo65

There is an excellent free piece of software that allows you to make
backups of your DVD's called DVD Shrink.  You can download it and
from:

http://www.dvdshrink.org/

There are step-by-step guides in how to use the software here:
http://www.dvdshrink.info/guides.php
http://www.mrbass.org/dvdshrink/
http://www.doom9.org/index.html?/mpg/dvdshrink31-main.htm

Before copying anything you should be aware that there are certain
situations where it may not be legal to copy the DVD you own, some
help on this subject can be gathered from here:
http://www.pcmag.com/article2/0,1759,1158650,00.asp
http://www.cdr-zone.com/faq.php?action=show&id=66#13
http://www.fastdvdcopy.com/en/faq.php
http://secure.smarterimage.com/solo/customers/support.asp?AID=2453128&QID=52197&mode=FAQ

If you need any further help on this subject please ask for
clarification and I will do my best to help.