The Synology DX1215 Expansion provides extra storage space for Synology NAS from the DS2000, DS3000, and DS2400 series. Install up to 120TB of capacity, thanks to 12 internal hard drive slots. Use the same Synology DSM software to control your device. On top of that, the DX1215 is immediately ready for use, since you don't have to format the drives of your existing NAS. Are you temporarily not using the device? If so, it automatically goes into energy-efficient mode, so you'll save energy and your drives will last longer. Use the high-bandwidth expansion cable (Infiniband) port to connect the expansion to your NAS.