Drive B Failure

I have the My Book World Edition II with blue rings. To my surprise I just accidentally discovered I have a drive B failure. So I have several questions this community may be able to help me with;

  • Why didn’t the drive tell me or indicate in some way there was a drive failure?

  • Have I lost data?  I have the drive configured as one linear drive and I haven’t had any backup failures to failure to access files?

  • Is there a tool for troubleshooting the drive? Something like windows “chkdsk”?

  • Can I upgrade the internal drives to a larger size?

Many thanks!

Data might be lost if the RAID was ‘0’.

And it is preferrable that you swap similar Capacity HDDs to stay compatible with the Controller.