Old Jail still exists in Storage, but not in Jail Storage. How do I delete it?

[csh8428]

An old install of Freenas failed, so I re-installed. I created a new jail on Dstar1_500GB disk; however, the old jail on Green2TB disk still exists in Storage, but NOT in jail storage. How do I delete the Green2TB Plexmediaserver jail?

EDIT: Ok I figured out how to do it. Select the Jail in storage and click on "destroy dataset", but I get message "This will delete all fiels within the dataset and child datasets". This jail resides on disk Green2TB. Does that mean the source data it points to on Red3TB will be delete?

Thanks,

Craig