What does this mean

Volume Type Disk Usage Size Status  
DataVolume Mirror   33% 1.82 TB

Degraded

  • 11/07 21:05:30 [Volume Status] Volume 'DataVolume' is in degraded mode.
  • 11/07 21:49:26 [HDD SMART] HDD 2 SMART Health Status: Failed.

but the drive says it is GOOD

Disk Volume Size Description Status  
HDD 1 DataVolume 1.82 TB WDC WD20EADS-11R Good  
HDD 2 Unassigned 1.82 TB WDC WD20EADS-11R Good Clean Disk

and what does it mean to clean the drive? 

Will this erase the drive or reformat or just defrag?

Hi masterwks8184, sorry for the delay. One of the internal hard drive appears to be faulty, to be sure you can remove one of the internal hard drives and run a test with DLG, if the test completes successfully try testing the other one. Check the link below for the steps. As soon as you replace the faulty drive, the RAID will rebuilt. 

How to test a drive for problems using Data Lifeguard Diagnostics for Windows 

http://wdc.custhelp.com/app/answers/list/search/1/kw/940

You need to get the smart status of that drive (get both) and then post here so we can advise, it might be a faulty drive or it might just be the result of using green drives in RAID. The thing with those greens is the URE rate is specified as 1 error in a little over 11TB read, in reality it seems better than that though. But basically if you read enough data from your array you are going to have a drive drop and if it’s because of an URE there is nothing at all wrong with the drive.

You can use smartmontools with HDD Guardian (you need both, and then load Guardian) to see through an Intel ICH RAID.