A couple of weeks ago I bought a Synology DS218+ NAS with two 2TB WD Red disks. After the initial setup, I wanted to remove RAID on Synology DS218 since we use the NAS mostly for streaming films.
I am not deep into RAID configurations and this is my first Synology NAS. So it was not straight away clear how to remove RAID on Synology DS218. I did not want to waste 2TB of usable disk space so I started to dig.
If you initially choose an automatic setup ( as I have done ) your disks will be configured in RAID. To remove RAID I needed to remove the volumes, delete the storage pool, and set up the disks as individual disks.
To be able to delete the storage pool I needed to uninstall the Synology DSM packages that have been installed on the volume I wanted to remove first. The name of those packages is listed when you choose a volume and click remove in Storage Manager within the Volume tab.
Create a new storage pool on each of your drives..
With a basic storage pool setup you can only choose Custom:
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