Firstly, I'm new & would like to say hello to all the members here Secondly, I did search & read the guides/faq. However most topics seem to deal with copying movies or CD's, not plain old data backup problems. I am using Windows Enterprise Server 2003 w/all critical updates, & burning with Nero 6 Ultra (220.127.116.11) onto a Toshiba SD-R5272. I backed up the server to 8 DVD-R discs, then formatted & reinstalled the (same) OS. Of all the backed up DVD-R's, only 1 was closed. The others were left open because many had only small amounts of data written to them with the intention of adding data in the future. Each disc [bold]was verfied[/bold] with Nero after the burning process. I did not use InCD (not installed) or the Nero ImageDrive feature (service was disabled by default). All seemed good.... Upon reinstalling Server2003, the single closed disc is the only disc that Windows can read. The 7 others cannot be read from Windows Explorer ("data may be corrupted" error). I do recall seeing the Nero warning prompt "..Operating Systems older than XP may have problems being able to read multisession discs..." However I'm using the exact same OS! Although I hadn't planned to, I did reinstall Nero & within the Nero Burning Rom Window can see my files. [bold]I desperately need acces to these files[/bold]. So, my questions are: 1. What did I do wrong? Do I have to close these discs for them to be readable in Windows? If so, why is this? 2. What's the point of having 4 1/2 GB to write to if I have to close the frigging disc each time I use it? 3. Am I confusing closing the session with closing the disc?