I have XP Pro Service Pack 2 and am using CDBurnerXP 4.2.3. My drive is TSSTcorp DVD+-RW TS-H653B and I am trying to write multi session Data DVDs. My problem is that if I continue the disc then all the files I have burned to it appear in the session window of CDBurnerXP (where the file appears when you add it to the disc). All files and folders appear here with the correct sizes. However, when I burn it I always have some files missing, sometimes entire folders, if I explore the disc through explorer. The disc is being used to test a version of an installer so this falls over as it can not find the files it needs. My settings are: File Settings = ISO9660/UDF/Joliet, File Filter = *.* When burning, I choose Continue Disc, Verify Data, eject the disc I add files simply by selecting them and adding them by pressing the add icon (large green plus sign). I am using DVD RWs and this is causing some major headaches. I am unable to use Roxio and Nero on this system for various reasons, so CDBurnerXP has been recommended. Many of my colleagues use it without problems. Can some one give me ideas as to why these files appear in CDBurnerXP but not on the disc?