Refreshing Episodes on Disk

My hard drive died on me so I need to re-download my episodes all over again. I was able to recover a couple, but not alot.

In Sonarr I go to the show and click "update series info and scan disk"
It completes the scan pretty fast, and there is no change. It says all the episodes are still there.
How do I rescan everything so it shows me what episodes I have, and what I don’t? I shouldnt have to delete the show then re-add it do I?

Sonarr won’t rescan if the root folder is missing for that series (If the root folder is T:\ and its not there anymore Sonarr will think it was disconnected and will need to be replaced or a new Series path chosen).

Also if the root folder is completely empty it will not rescan it, just add an empty folder (not a file) there and Sonarr will scan it.