Julius. The neo comes out of the box with the hard drive partitioned from the factory. The hard drive has three partitions, being 32 gigs each plus an eight gig FAT partition for files to be exported. The eight gig partition cannot be used for recording. One can reformat the hard drive into smaller partitions, but then your recording time per partition is shorter. A backup cd written by the neo cannot be read by a pc.
One can backup data to pc via USB, and you can reload songs via USB from the pc hard drive .
In addition to making a data backup cd, you should also do an audio cd by first using the live writer feature on the neo. Mix down to a stereo master track, then make your audio cd. You must first mix down to a master track in order to do this. Your neo manual has all this information. If you lost / damaged your manual, one can be downloaded free at Tascam.com
You may have missed a step in trying to reload the data cd back into the neo..., that, or you may have chosen a different partition to search for your recorded work. Check the other partitions to see if it can be found. If you did not purposely delete the work, it should still be there.
Once you find it, you can again attempt to create a backup cd.
Happy Tracking
OB77......................................out.