Data lost with DirectCD 2.5d



Can anyone help me, I have a BIG BIG problem.

I have used DirectCD 2.5d to create a CD on Windows98 (it is a TARGA CDRW-disc).
I did not "close/finish" the CD like you normaly do.
I rebooted the system, and went playing with drive letters in Windows 2000, and changed some drive letters.
Then I rebooted the system back to Windows98 and I lost all the contents of the CDRW-disc.
DirectCD says it is an empty read-only volume now!

How can I restore the contents of the CDRW????


Thanks in adavance.