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How to repair volumes on Synology NAS
Posted by MatjažS Admin, Nazadnje spremenjeno s strani MatjažS Admin on 11 April 2014 10:46 AM

How to repair volumes on Synology NAS


When a volume suffers a hard disk failure or another issue, your DiskStation will warn you with a beeping sound. Volume errors might be caused by various issues, such as damaged system partitions or crashed hard disks. In this tutorial, we'll teach you how to diagnose various volume issues, repair system partitions, and replace failed hard disks.

  • The Repair function described in this tutorial is available only for RAID types with data redundancy (e.g. RAID 1, RAID 5, RAID 6, etc.). Please note this function does not repair broken hard disks, nor does it guarantee data on crashed volumes will be rescued.
  • For Crashed volumes, we recommend contacting our Support Team for help. Please see the Resolving crashed volume issuessection below for things to do before contacting us.


  1. Turning off the beeping sound
  2. Diagnosing the problem
  3. Repairing volumes
  4. Resolving crashed volume issues

1. Turning off the beeping sound

Your DiskStation will emit a beeping sound when a problem occurs. To deactivate it, go to Main Menu > Storage Manager > Volumeor Disk Group and click the Beep off button.

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2. Diagnosing the problem

First, you'll need to understand what's wrong with your volume. In the sections below, we'll explain how to check the status of volumes and hard disks.

2.1 Checking volume status

To check the status of the volume, go to Storage Manager > Volume or Disk Group and check the Properties section.

The table below provides a brief explanation of each status:

Volume/Disk Group StatusDescriptionSolution
Normal – System Partition Failed There are damaged system partitions on one of the hard disks. Refer to the Failed system partitionssection for more details.
Degraded One or more hard disks in the volume have failed, but data loss has not occurred. Refer to the Degraded volumes section for instructions to repair the volume.
Crashed A volume might crash due to various reasons, such as unexpected power loss, unmountable file systems, or broken hard disks. Refer to the Resolving crashed volume issues section for more details.

2.2 Checking hard disk status

The status of individual hard disks can be found at Storage Manager > HDD Management.

Hard disk numbering: 
Hard disks installed in DiskStations with two or more bays are numbered from left to right and from top to bottom. To learn more about identifying hard disks installed in your DiskStation, please see here.

Under normal circumstances, the status of hard disks should be Normal or Initialized. When a problem occurs, it might change toNot InitializedSystem Partition Failed, or Crashed. The table below provides details regarding these status types.

Hard Disk StatusDescriptionSolution
Not Initialized The hard disk is operating normally, but contains no system partitions or data partitions. Simply include the hard disk in a volume or Disk Group and it will be initialized.
System Partition Failed The system partitions on the hard disk are damaged. Refer to the Failed system partitions section for more details.
Crashed The hard disk might be damaged or the file system has become unmountable. Refer to the Resolving crashed volume issues section for more details.

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3. Repairing volumes

In some situations, such as when system partitions are damaged or a volume is degraded, you can simply fix the problem yourself. In the sections below we'll look at fixing two issues:

  1. Failed system partitions
  2. Degraded volumes

3.1 Failed system partitions

This problem occurs when the system partitions on a hard disk are damaged. The system partitions are where your DiskStation stores the necessary files for running the system. When partitions fail, the volume status will be Normal. Do not worry; your data is safe. To repair the hard disk, simply click the link marked Repair the system partition.

3.2. Degraded volumes

A volume becomes Degraded when one or more hard disks have failed, but data loss has not occurred. This only happens with volumes that provide data redundancy, such as SHR, RAID 1, RAID 5, RAID 6, and RAID 10. Please refer to this table to see how many disk failures can occur with different RAID types.

To repair a degraded volume, please follow the steps below:

    1. Log into DSM with an account belonging to the administrators group.
    2. Go to Main Menu > Storage Manager > Volume or Disk Group.
    3. Go to the HDD Management tab to see which hard disks have failed. To learn more about identifying hard disks, please see here.
    4. Remove any failed hard disks and replace them with new ones. (If your DiskStation does not support hot-swapping, please remember to power it off before removing and installing any hard disks.)
    5. After replacement hard disks have been installed, go back to the Volume or Disk Group tab.
    6. Select the degraded volume or Disk Group that you want to repair.
    7. Click Manage
    8. Select Repair and click Next.
    9. Select the replacement hard disks which you would like to add to the volume. Then click Next. (Any existing data will be erased, so make sure there's no important data on the replacement hard disks.)
    10. Check your settings on the confirmation page. Click Apply to confirm and start repairing the volume. You can go back and modify settings by clicking Back
    11. Time needed to finish repairing a volume varies depending on your environment. Once finished, the status of the volume should return toNormal.
Note: If a volume becomes Degraded due to the same hard disk many times, it means the disk may have defective sectors or other problems. You can follow the section below to perform a S.M.A.R.T. test to get more details about the disk.

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4. Resolving crashed volume issues

When the status of a volume becomes Crashed, you cannot repair the volume by yourself. To solve this problem, we recommend contacting our Support Team for help.

A volume enters Crashed-Read-Only mode when data inconsistency occurs on the hard disks. This might be due to unexpected power failure during a write process. In this case, data loss might occur. Please backup all the data you can and create a new volume. To backup data, you can consult this article.

Before contacting technical support, please do the followings:

  • Keep the order of the hard disks the same as when the volume crashed.
  • Please perform a S.M.A.R.T. test on the problematic hard disks. To do so, log into the DiskStation with an account belonging to theadministrators group. Then go to Main Menu > Storage Manager > HDD Management. Choose the hard disk in question and click S.M.A.R.T

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Comments (8)
Jean-Yves Bisiaux
13 December 2016 06:30 AM
Despite the message on the Synology console, a backup cannot be performed when a volume is in Crashed-read-only mode. Because it need to write its backup build on the local disk.
Jim Pedersen
04 April 2017 10:15 PM
I can locate my DS212+ on the network, and now I have tried Direct ethernet connection, too.

But when I try to connect to my DS212+, my Connection Status display: “Forbindelse mislykkedes” (Danish - in UK: “Connection Failed”, I think).

Now, I also have tried to insert ONE new 200GB Hard Disk and Install it from start. The DS212+ works fine with the new Hard Disk.
So now I’ll like to get my data from one of my two old Hard Disks. I have run RAID1 with two 2TB HD (identical types).

When I cannot connect / log in to my DS212+ with the two old HD in the DS212+, how do I read the data from one of the HD?
Will it work, if I put the 2TB HD into the DS212+ together with the new 200GB, after it have booted the DS212+ or do I risk losing my data on the 2TB HD?

Do you have any advice?

Best Regards,
Jim Pedersen
Marko Lipovec
05 April 2017 04:04 PM
Dear Jim,

I would suggest you to power on your Synology with just one of two original hard disks.
After boot up use recovery procedure. It will reset your "admin" password and network setting on to default:

Download Synology assistant tool:
and find your Synology on your network.

Now you will be able to access your data on Synology.

If something goes wrong, choose recovery procedure with DSM reinstallation:

Reinstall DSM.
Your data is safe and will be not touched.
After DSM re-installation you will be able to use your data again.

Best regards, Marko

Jim Pedersen
08 April 2017 10:52 AM
Dear Marko,
Thanks for your reply, it is greatly appreciated (since I have got no meaningful response from the Synology support). I have come so far that I have reset and installed the latest version of DMS and gained access to my Hard Disk. (The password reset only did not work). It is now degraded and seems to have the data area untouched. I have ordered a new hard disk to complete the repair on. I will return with the results later, hopefully a good end of the story.... :-)
Jim Pedersen
13 April 2017 01:04 PM
I have now installed a new hard disk and run repair. I've got access to all my data; but my Synology still says that my Volume on the new HD is Degraded and must be repaired to a new HD. So I started to copy data to an external HD and planning to start my Synology up from scratch.
Thanks for your advice, Marko, and Happy Easter!
Regards Jim
Marko Lipovec
18 April 2017 02:30 PM
Dear Jim,

Thank you for wishes and additional information.
I am surprised that Synology did not help you. I have very good experience with their support.
Anyway - you got your files back and you could make backup now what is preferable.
Your problem is not very common so starting from the scratch is best advice I could give you.
When you will have your system freshly installed just copy your data back.

Best regards, Marko
Stuart Drury
27 May 2017 01:00 AM
Hi, Just a quick question, my one drive crashed in my raid setup of only 2 disks so I removed the drive. So now the nas is saying that disk one is degraded and shows an error message but I do not have another drive to replace that one just yet so how do I turn off the error message and basically remove the Rid setup so that it is just 2 by Synology with one hard drive not in any rid formation? Thanks.
Marko Lipovec
29 May 2017 08:22 AM
Dear Stuart,

It is not possible to degrade RAID system to the basic JBOD system.
You could turn off beeping in Hardware & Power section of your Control panel and you could also turn off notifications in Notification -> Advanced section of your system.

Best regards, Marko

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