If your storage pool is configured with Basic, JBOD, RAID 0, or SHR consisting of only one drive, follow the instructions in this section.

1. Back up all your data.
2. Go to Storage Manager > Storage Pool.
3. Select the storage pool that contains the incompatible or unverified drives.
4. Click the Remove. During the removal process, all services will temporarily stop, and all data on the storage pool will be deleted.
5. Power off your Synology NAS.
6. Replace all incompatible or unverified drives with compatible drives.¹
7. Power on your Synology NAS and, if needed, reinstall DSM.²
8. Create a new storage pool and volume.
9. Restore your backed-up data.

If your storage pool is configured with RAID 1, RAID 5, RAID 6, RAID 10, RAID F1, or SHR consisting of at least two drives, follow the instructions in this section.

2.1 Check for and replace any defective drives

If there are any defective drives in the storage pool, replace them first.

1. Go to Storage Manager > HDD/SSD.
2. Select a drive from the list of drives.
3. Click the drop-down icon to expand the drive information and check the Allocation status.
4. If the allocation status of the drive is Crashed, replace it with a healthy one.

2.2 Replace the incompatible or unverified drives

If all other drives in the storage pool are healthy, you can proceed to replace the incompatible or unverified drives.

1. Power off your Synology NAS.
2. Replace one incompatible or unverified drive with a compatible drive.¹ This must be done one at a time.
3. Power on your Synology NAS.
4. Go to Storage Manager > Storage Pool.
5. Select the storage pool that needs to be repaired and repair it using the compatible drive that you have installed.
6. Repeat the above steps until you have replaced all the incompatible or unverified drives.

If your SSD cache is read-only, follow the instructions in this section.

1. Go to Storage Manager > SSD Cache.
2. Select the SSD cache you want to remove.
3. Click Remove. During the removal process, all services will temporarily stop.
4. Replace all incompatible or unverified SSDs with compatible SSDs.
5. Click Create to create a new SSD cache.

If your SSD cache is a read-write cache, follow the instructions in this section.

4.1 Check for and replace any defective SSDs

If there are any defective SSDs in the SSD cache, replace them first.

1. Go to Storage Manager > HDD/SSD.
2. Select an SSD from the list of drives.
3. Click its drop-down icon to expand the SSD information and check the Allocation status.
4. If the allocation status of the SSD is Crashed, replace it with a healthy one. Keep in mind that the replacement SSD must be larger than or equal to the size of the original SSD.
5. Click the Repair button.
6. Select the replacement SSD from the list.
7. Click Apply.

4.2 Replace the incompatible or unverified SSDs

If all other SSDs in the SSD cache are healthy, you can proceed to replace the incompatible or unverified SSDs.

1. Go to Storage Manager > SSD Cache.
2. Replace one incompatible or unverified SSD with a compatible SSD.
    This must be done one at a time.
3. Click Repair and select the replacement SSD from the list.
4. Click Apply.
5. Repeat steps 2 to 4 until you have replaced all the incompatible or unverified SSDs.