Re organise hard drives

[Enquiries]

Hi
I have ds920+ with 4 6tb drives
At start I used 3 drives with 4th set up as a hot spare
I then had issues with faulty drives so the spare got used up
I want to get back to situation with 3 drives and a hot spare.
When I try to deactivate drive 4 it asks me for a synology account number.
Can I switch unit off and then pull out 4th drive and then rebuild raid.
I am a beginner
Regards

[ed]

Technically, if you power off the NAS and simply move the drive from Bay 4 to Bay 3, the RAID should be smart enough to recognize the drive order automatically when you power it back on.

If, for some reason, it doesn’t work as expected:

Power off the NAS again, remove the drive in Bay 4 entirely.
Power the NAS back on and let the system rebuild the RAID with the remaining 3 drives (it should detect and adjust).
Once the rebuild is complete, you can reinsert the drive in Bay 4 and set it up as a hot spare via Storage Manager.