Yes, from what you described as having done, you need to CLEAR it, then assign it as a hot-spare.  If you import it, you will corrupt your array
Hi, I just got a PowerEdge T620. The OS is in RAID1 (two 256GB SSD's), controlled by a PERC H710P Controller.  While the computer was OFF, I took one of the drives out, to see what brand it was. (I bought the computer from a certified re-seller and just wanted to make sure I got what I paid for :emotion-2:). Anyhow, after turning the computer back on, I noticed that the little screen in the front had changed color and was displaying a message. I checked OFF the message and the computer seemed to be working fine with only ONE drive in. As it is supposed to. I decided to put the drive back in - while the computer was OFF. I noticed, that on boot up, the system is now saying: "Foreign configuration (s) found on adapter Press any key to continue or "C" load the configuration utility or "F" to import foreign foreign configuration (s) and continue." I did a search on here and on Google, and was able to find something, that looks like an 'Answer' to me. However, since I have never done anything like this before, I would like to ask you guys, and see if I am about to do the right thing!? - When the system boots up, I press Ctrl-R. - I get to the PERC H710P Adapter BIOS Configuration Utility 4.00-0014 - Next I press 'Ctrl-N' till I get to the 'Foreign View' page. - Once there, I highlight 'PERC H710P Adapter (Bus 5, Dev 0)'. - Once highlighted, I press 'F2'. - After pressing 'F2' a window pops up, that says 'Foreign Config'. - Next I press 'ENTER' and another window pops up with two options: - 'IMPORT' and 'CLEAR' From what I read, I need to select 'CLEAR'??? Not sure though?! thanks, G  p.s. I uploaded some pictures showing the PERC BIOS... [IMAGE] [IMAGE]  
How to add my "pulled" drive back to RAID1, on PERC H710P and clear foreign 
configuration(s)...