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How do you fix a degraded hard drive?

Author

Olivia House

Published Feb 20, 2026

How do you fix a degraded hard drive?

To repair a degraded storage space on the active server:
  1. Go to Storage Manager > HDD/SSD to see which drive is defective on the active server.
  2. Replace the defective drive on the active server.
  3. Go to Storage Manager > Storage Pool and select the degraded storage space.
  4. Click Repair from the Action drop-down menu.

Besides, what does a degraded hard drive mean?

Degraded Mode is a term that refers to the status of a computer running RAID. Degraded or Partially Degraded – One or more of that hard drives in the RAID have failed but the RAID still continues to function with no data loss, but significant restrictions in performance.

Also Know, how do I fix RAID 1 degraded? Here's how:

  1. Prepare a new hard drive to rebuild the RAID configuration.
  2. Remove the faulty drive from the NAS.
  3. Install the new drive into the NAS.
  4. If you check the RAID Group information in the Storage Pool or Static Volume manage window, the status will be Rebuilding and the progress will be shown.

Regarding this, how do you fix a degraded disk?

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.
  4. Remove any failed hard disks and replace them with new ones.

How do I fix RAID 5 degraded?

Raid 5

  1. Remove bad disk (hot swap so no need to power down the machine)
  2. Replace with a good disk of same size or larger.
  3. It automatically rebuilds the array.
  4. Once the rebuild goes to 100% it still showed in degraded state.
  5. Clear logs.
  6. Clear alert log.
  7. Do a global rescan.
  8. Everything shows a good status and running without problems.

What is RAID rebuild?

A RAID rebuild is the data reconstruction process that occurs when a hard disk drive needs to be replaced. When a disk fails unexpectedly, a RAID array copies data to a spare drive while the failed one is replaced. Data is then reassembled on the new drive using RAID algorithms and parity data.

What is RAID volume?

RAID ("Redundant Array of Inexpensive Disks" or "Redundant Array of Independent Disks") is a data storage virtualization technology that combines multiple physical disk drive components into one or more logical units for the purposes of data redundancy, performance improvement, or both.

Does RAID 1 automatically rebuild?

Yes, that's the purpose of RAID-1. When a drive in RAID-1 fails the raid enters "rebuild mode". When the failed drive is replaced it will automatically start cloning the data from the intact disk. "how" you rebuild it is entirely dependent on the raid controller.

Are QNAP drives hot swappable?

The SATA standard supports hot-swapping so both disks and the NAS support it: "Unlike PATA, both SATA and eSATA support hot swapping by design."

How do I change my QNAP disk?

Go to “Storage Manager” > “Storage Space“. Select the storage pool that will be expanded, then click “Manage“. The “Storage Pool Management” window will appear, select the RAID group that will be expanded and click “Replace Disks One by One” in the “Manage” menu.

How do I fix RAID 1 Dell degraded?

Right-click the available hard drive on which to rebuild the RAID 1 volume and click Rebuild to this Disk. The computer can be used normally while it is rebuilding the RAID 1 volume.

How do I replace a failed hard drive in my Synology NAS?

How to Replace a Failed Hard Drive in Your Synology NAS
  1. Step One: Identify the Failed Drive. When a hard drive fails, Synology lets you know about it by loudly beeping at you.
  2. Step Two: Remove and Replace. After determining which hard drive went kaput, you can remove it from the NAS enclosure.
  3. Step Three: Test the New Hard Drive.
  4. Step Four: Repair the Volume.

How do I upgrade my Synology hard drive?

To replace drives:
  1. Open Storage Manager.
  2. Go to Storage Pool to see which existing drive is the smallest.
  3. Turn off your Synology NAS.
  4. Remove the smallest of the member drives and install a new, larger drive.
  5. Turn on your Synology NAS.
  6. Open Storage Manager again.
  7. Go to HDD/SSD to make sure the new disk is recognized.

What is hot spare Synology?

Hot Spare: On models that support the feature, a hot spare is an HDD that occupies a spare drive slot. It is initialized and registered in Storage Manager as a Hot Spare. If another drive goes into a degraded state, the system will bring the hot spare on line to replace the faulty drive.

What is Synology storage pool?

With Unified Controller, you may combine multiple drives into a single storage unit called a storage pool. Volumes can be created on top of storage pools. Volumes may be expanded if a storage pool has allocatable space. Different RAID types offer varying levels of data protection.

What is Synology Data scrubbing?

Data Scrubbing is a data maintenance feature that inspects storage pools. File system scrubbing: This function will check the volumes in Btrfs file system. If any data inconsistent with the checksum is detected, the system will try to use a backup to repair the data and the file path will be recorded in Log Center.

How do you run a smart test on Synology?

Log into the web interface and go to Main Menu > Storage Manager > HDD Management. You can also schedule a more in-depth SMART test using the Test Scheduler Option on this screen. As Daxlerod has stated you should use the SMART tools, however you also need to perform what is called data scrubbing.

What is Synology Hybrid RAID?

Synology Hybrid RAID (SHR) is an automated RAID management system from Synology, designed to make storage volume deployment quick and easy.

How do I fix my Synology NAS?

Go to Synology High Availability > Storage > Volume and select the degraded storage space. Click the Repair button.

How do I restore raid?

How to recover RAID
  1. Download, install, and launch ReclaiMe Free RAID Recovery software.
  2. If needed, open or create disk image files of the member disks using the Disks button.
  3. Decide on the type of your array.
  4. Wait until the software completes detecting the parameters.
  5. At the step all the parameters have been already restored.

How long does it take to rebuild a RAID 1 array?

RAID Disk Failure Calculator from Memset
Disk Size (GB)Rebuild Timeraid6 with 1 hotspare
DLO/y
2506 hours, 56 minutes1 in 802.0
50013 hours, 53 minutes1 in 646.6
10001 day, 3 hours1 in 402.2

How do I replace disk in RAID 1?

Replacing a Failed Mirror Disk in a Software RAID Array (mdadm)
  1. Mark the disk as failed. # mdadm --manage /dev/md0 --fail /dev/sdb1.
  2. Remove the disk by mdadm. # mdadm --manage /dev/md0 --remove /dev/sdb1.
  3. Replace the disk. Replace the faulty disk with new one.
  4. Copy the partition table to the new disk.
  5. Create mirror.
  6. Verify.

Will be rebuilt within the operating system?

"Volumes with Rebuild status will be rebuilt within the operating system" means exactly that, Rapid Storage relies on a driver within the OS to perform it's work. It is incapable of doing any actual RAID'ing by itself.

Can you create a RAID array without losing data?

It depends on your RAID solution. Many RAID solutions format a disk when constructing a RAID or adding a new disk. Desktop versions of Windows Windows have a built-in software RAID capability which will attempt to preserve your data during conversion.

How do I change my foreign disk to online?

Bring a foreign disk back to an online state
  1. Right-click on the disk and select Import Dynamic Disk Group. A dialog box comes up that displays the name of the dynamic disk group.
  2. Indicate the name for the dynamic disk group as follows:
  3. If you import a dynamic disk group from a different system, then click the check box to clear the host ID of the other system.

What happens when a drive fails in RAID 5?

When a single disk in a RAID 5 disk array fails, the disk array status changes to Degraded. The disk array remains functional because the data on the failed disk can be rebuilt using parity and data on the remaining disks. If a hot-spare disk is available, the controller can rebuild the data on the disk automatically.

How do I replace a RAID drive?

To replace a failing RAID 6 drive in mdadm :
  1. Identify the problem. More Linux resources. Advanced Linux Commands Cheat Sheet for Developers.
  2. Get details from the RAID array.
  3. Remove the failing disk from the RAID array. Shut down the machine and replace the disk. Partition the new disk.
  4. Verify recovery.

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