The source and target volumes have not been scanned.
Every time NDS Migrator is reopened a message pops up informing that files have not been scanned yet.
Migrator for NDS wants you to scan the volumes before every file migration. However, this message can be ignored. There is no real requirement to perform a scan before a migrate. The scan just lets you know proactively of any issues, such as file names/paths with more than 255 characters, etc…