Hello,

I got Dell Storage SCv2020 with one SC100 expansion with 24 drives. One of the drives failed and I needed to replace it. All the drives in the SC100 are 1.2TB Dell Enterprise plus SAS 12Gbps, 10K RPM. I am trying to replace this failed drive with another Dell SAS drive but this is 2TB 12Gbps, 7,2K RPM. I have located the failed drive with Dell storage manager and I go step by step, first clicking on the replace disk option and going through the steps. Dell storage manager fails to replace the disk and shows a message "The Storage Center has not recognized a new disk after several minutes..." After that, I noticed that this drive is attached to the storage as an External Device (I found it in the External Devices folder). 

I have read about the Dell Compellent drives and I don't know if this is the problem? I will attach a picture from the new drive below. Any suggestions what is the problem here?

Thanks!