DVD-RW: How to reformat using Roxio Easy CD DVD?

Hi,

I am using the plantinum version of Easy CD DVD 5. If I insert a new
unformatted DVD+RW disc, I am given the option of "full format".
However, if I insert a previously used DVD+RW disc, the "full
format" option is always grayed out. I can only do a "quick erase".
Is there a way to force the system to do a "full format" on a used
disc?

I noticed this weird thing about DVD+RW disc (Verbatim brand). I
have 3 DVD drives that can read DVD+RW media. However, sometimes the
media is not readable after it is inserted in the drive, but other
times, the same media can be read without any problems--no change has
been made to media. Can't seem to find a pattern. Is this common?

Thanks in advance,

Terry