HDD RAID Expansion Question

Hi there.
Can somebody tell me for sure?
If I have a NAS with one HDD installed, and after a month for example I buy two more HDDs.
Can i make a RAID 5 from these three drives without losing my data from the first drive?

I know you can expand an already set RAID 5 with additional drives without having to format the drives.
I just don’t know if you can do it without having a RAID in the first place, with just one drive to start with.

Thanks everybody in advance

I don’t think you can go from no raid (basic) to raid 5. The only workaround I can think of is install the 2 new drive and create a new storage pool with raid, transfer the data over, then delete the storage pool with no raid and expand to it from the new raid storage pool. BTW FYI I’m not sure which model and how many bay nas you have, but if you are going to use an expansion unit, it is not recommended to expand your storage pool across the main and expansion unit.

I know that i shouldn’t expand volumes across units. I’m not going to do this.
I think tha safer way will be to initially have 2 drives with separate volumes and then add the adittional 3 remaining drives in RAID 5 config (The NAS is the DS1522+ with 18tb drives).
Because I want to keep business and personal staff in separate volumes. and have a backup through selected Syncing Folders.

You are able to do exactly this. You can convert from basic to RAID 5 or RAID 1. Info about all the options here:

But its pretty much anything you would need to do!

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