How to check the HDD health (Crystal/Solo/Mini2)  


How to check the HDD health?


Step 1: Check RAID Status page. The meaning of each RAID status is as below:

  • Functional: The RAID volume is working normally.
  • Critical: One or two HDDs are faulty in the RAID volume. Due to the faulty HDD amount is still lower than the RAID fault tolerance disk number, the RAID volume is still working and recording is still continuously but recommend to fix it ASAP.
  • Offline: The RAID config is existed but the disks cannot be found on the NVR. Video recording is stopped. Sometimes it occurs when remove the HDD from the NVR but doesn’t reboot yet. Reboot NVR will re-sync the RAID status as current situation.
  • File system error: The RAID structure is corrupt and cannot be recovered due to the faulty HDD amount is more than the RAID fault tolerance disk number. Recording is stopped and cannot be recovered anymore.

Note: only “Critical” and “File system error” need to be recovered.

Step 2: Try to find out the faulty disk(s). There are two ways to find out it:

1. System log: If the system log shows the keyword “I/O error‘, it means the disk has damaged sector.


2. S.M.A.R.T Tool. The checking result will be shown on Drive Health (S.M.A.R.T.).

NVRmini2/Solo/Solo Plus/Champ (Recommend to upgrade to firmware 3.6 or above)

Crystal (Recommend to upgrade to firmware 3.8 or above)

"sda" means SATA DOM. Please start disk test from "sdb". The disk 1 is sdb, disk 2 is sdc, and so forth.

Step 3: Once you find out the faulty disk(s), please shut down the NVR then replace it.

Step 4: Turn on the NVR then follow below Wikis to recover the RAID.

How to handle RAID status "Critical"?

How to handle RAID status "File System Error"?

If you checked the disk status it shows "Passed" but the RAID still cannot be created successful, please contact NUUO tech support via Zendesk, we will help you to check the current RAID status.


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