No free space on DVD No used space

[misto]

When I place a dvd-rw disc in the drive I am unable to copy to it.
When checking properties box it shows no free space and no used space.
Have been trying to find the problem for two weeks without success.
I am able to copy to my flash drive without any difficulty.
The drive is a writer and had been working very well until two weeks ago.
I am running Windows XP Home
I can write to cd-r/dvd+-r
1 optical drive
The software is Sonic, the drive is two years old.
Help woud be very much appreciated.

[Panic Button]

Does your device work with DVD-RW, or does it require DVD+RW?

Have any other -RWs worked in it?

Does the disc need formatting?

[misto]

DVD-RW
Does not need formatting