Yes, means it can't find it. It may show up after a reboot, but either way, you can simply remove the drive and insert the new one. Make sure to swap it "hot". If it doesn't start rebuilding automatically, then you will need to assign it as a hot-spare (if it is showing as Ready). If it is showing as Foreign, you need to Clear that foreign configuration first, then assign it as a hot-spare.
Hello, Just wanted to confirm that I can take status "Removed" the same way as it being "Offline"? Therefore I should just be able to replace via hot-plugging my drive with a new one and it will rebuild/sync raid5 with new disk? PS, server setup: PowerEdge 730XD, w/ PERC 730mini  Apologies if this is a often asked question, but my search queries really didn't return anything useful about state: removed. I guess It just means that drives could be so gone that it is undetectable by HW? Also I'm quite new with dell HW.
PERC, state removed = offline?