Yes — according to the knowledge base, a drive with bad sectors and Critical/Failed status should be replaced.
What the sources say:
- For Failed drive status, Synology recommends: back up your data and replace the drive immediately.
- For storage that is degraded, Synology says to replace the failed hard drive with a new, healthy drive in the same slot and then repair the storage pool/volume/LUN in Storage Manager.
- For DSM 7.2.1 or above, you should check the drive status in Storage Manager > HDD/SSD to confirm whether replacement is needed.
How to do it:
1. In Storage Manager > HDD/SSD, confirm the drive status.
2. Make sure you have a healthy compatible replacement drive that is:
- in the Synology compatibility list,
- equal to or larger than the smallest drive in the degraded volume,
- the same drive type as the others in that volume.
3. Replace the defective drive with the new healthy drive in the same slot.
4. Then repair the storage space in Storage Manager.
If the storage is part of Synology High Availability (SHA), the guide says the active server’s degraded storage should be repaired by replacing the damaged drive and then repairing the volume/LUN in Storage.
Sources used: [8], [10], [1]