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The FS3017 Expansion Card (FXC17) is exclusively designed for Synology FlashStation FS3017 to connect to Synology expansion units RX1217sas and RX2417sas. When the storage capacity of FS3017 reaches its limit, install the card to FS3017 to support up to two RX1217sas or RX2417sas for additional storage capacity. FXC17 is backed with Synology's 5-year limited warranty.