Hello DenisNao, You can remove the drive and replace it with your new drive.  That sticker is on those drives so that you know where the OS is loaded. You can replace those drives when they fail just like any other drive. Please let us know if you have any other questions.
Good Day for all! On this disk write : "Removing these drives willmake the array unusable".  Hot spare in use now, and i have new same EMC hdd.  Can i just replace fault disk to another one? It ok?
VNXe 3150 Disk in slot 3 with system OS fault