What is FileStore?
FileStore (NS3) consists of many terabytes of file system-based storage capacity, geographical replication, a massively scalable architecture, and proprietary mapping and routing technology. This storage group version supports all current NetStorage functionality—both in configuration, as well as the protocols available for use in transfer. All storage groups in place prior to April, 2014 were configured using this version.
This is considered the legacy format of storage group.