Asustor AS4004T 10 Gigabit NAS Review - Product Gallery

Located at the backside we can see a ventilation hole, the unit is very silent, and it will regulate fan RPM depending on the temperature and/or configurable fan preference. You can configure power saving and fan options in the software suite. There are a few connection options including USB 2.0/3.0/3.1 (one at the back, one in the front). 

• CPU: Marvell ARMADA-7020 1.6GHz (Dual-Core) Processor
• Memory: 2GB DDR4
• Memory Expandable up to: not expandable
• HDD: 4 x SATA3 6Gb/s; 3.5"/2.5" HDD/SSD
• Maximum Internal Raw Capacity: 48 TB (12 TB HDD X 4, Capacity may vary by RAID types)
• Maximum Drive Bays with Expansion Unit: 12
• Maximum Raw Capacity with Expansion Units: 144 TB (12 TB HDD X 12, Capacity may vary by RAID types)
• Expansion: USB 3.1 Gen-1 x2
• Network: Gigabit Ethernet x 2; 10Gigabit Ethernet x1
• PCIe Expansion Slots: 10GbE Built-in
• Output: N/A
• System Fan: 120mm x 1
• Power Supply Unit / Adapter: 90W x1
• Input Power Voltage: 100V to 240V AC

Missing is an HDMI connector, this is a budget model to bring 10 GbE to the masses so there is no home media center functionality.

At the (new) front side, you can see a USB 3.1 connector on the lower left. There are also LED indicators for the operational status of the NAS. To the top left, you'll find the power button and status LEDs. 

A front plate covering the HDD bays, a great option that prevents dust build-up. It's secured with four little magnets, you just pull it out gently, and you can access the four HDD/SSD bays. Yes, pop four 12 TB HDDs in there and you'll have a 48 TB NAS cluster. It looks good with the dark design. Over the Gigabit jack, this unit is capable of read speeds of over 110 MB/s. Over 10 Gbps, the metrics are hugely faster. We'll show you that in the benchmark results of course. Link aggregation is still possible as well, you can nearly double that 1 Gbps number, albeit I feel that link aggregation is a dying thing in the SOHO and consumer space, I bet most people do not even know of its existence.

Here you are looking at the bottom, the unit rests on four rubber feet to prevent resonating noises from the HDDs.