Drive replacement question

I have a Drobo S that had a failed drive, bottom slot. Red light. I took it out and want to put a replacement drive in but the existing 4 drives are in data protection process, (bebuild). The 4 lights are flashing green and amber. Can I still put the new drive in the bottom slot that has a red light or do I have to wait for the rebuild? Thanks, Jason

I believe you can replace it while it’s flashing, yes. Just don’t knock another one loose!