So, I got a message saying that one of my older disks is damaged and I may have lost data.   Fortunately, I use DrivePool with duplication.   I had Scanner scan the disk and the file system, but it kept showing the error saying it was unable to read one cluster and I may have lost data.   So I ran the windows checkdisk with the option to scan for bad sectors -- it found some problems -- but Scanner continued to say the disk was damaged etc.   I reran the Scanner scan of the disk and file system,