I have three drives that are showing unreadable parts of files like AVIs

[BirdDad]

I have three drives that are showing unreadable parts of files like AVIs that will not copy to another drive. Does this mean that I have bad sectors on all drives?
Does that mean that all three drives are going bad? They are WD black.

 

[Coup27]

Run a diagnostic tool on the drives.

 

[Elixer]

What does SMART show for those drives?

 

[Cerb]

Most likely the file system is corrupted, but check the drive anyway.