Unable to delete partition "Partition_Name". The partition is not empty.
The error will appear as follows:

The partition to be deleted is not empty. The partition must be empty in order to allow the deletion to occur. Deletion occurs when users delete items, Archives are deleted, or through Storage Expiry. Alternatively, the Vault Store itself can be deleted, which will remove the users and Digital Vault Saveset (DVS) files associated with them.
Another scenario in which the partition may not be empty, even if all the Archives associated with the Vault Store are deleted, is if sharing is enabled within the Vault Store Group. This will allow other Vault Store Archives to point to shared items in this partition. In these scenarios, there might not be any *.DVS files in the folder structure of the partition but there may be *.DVSSP and *.DVSCC files. Do not delete them as they may be associated with other archives in other Vault Stores.
Note: Deleting the files manually, or the partition manually, will cause failures in recalling items which point to these shared parts.