QNAP VS-2012 VioStor NVR 4TB. Total storage capacity: 4000 GB, Hard drive capacity: 2000 GB, Hard drive interface: Serial ATA II. Memory type: DDRII RAM, Internal memory: 1024 MB, Flash memory: 128 MB. Processor model: Intel Atom. Weight: 2.92 kg. Operating relative humidity range: 0 - 95 %, Operating temperature range (T-T): 0 - 40 °C