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The Array R2 is a slightly updated version of the Array Mini ITX
NAS case. The new features/upgrades are;

Features

• Two expansion slots instead of one, enabling support for Mini
  DTX M/B
• Improved HDD cage
• Improved front fan module

Exclusive Storage!
The Array R2 Mini ITX NAS case is setting new standards for the Home Server/DIY NAS market. With it's whopping six(!) hard drive bays in a very small enclosure, hardly bigger than your average bread toaster, it's certainly creating a new niche.

Built in high quality aluminium straight through with a nice touch for details, the Array R2 case provides a very exclusive way to store all your important data. The hard drive cage with room for six 3,5-inch HDD and one SSD, is removable and fitted with silicone anti-vibration grommets to minimise noise from the hard drives. In the front our award winning Silent Series 140mm is fitted, together with a washable filter. It takes in air from the side ventilation holes in the front panel. This ensures an efficient, but yet silent, cooling over the hard drives.
Furthermore, there is a SFX 300W PSU included, rated at more than 80% efficiency, with a silent temperature controlled fan. We have decided to include this PSU in the package, since it's fairly hard to find quality SFX PSU's in the market that is also silent, and not too expensive.

You can fit a Mini ITX or a Mini DTX motherboard into the case and there's also room for two expansion cards, for example a RAID card which you'd typically want to get the most out of your six hard drives. All necessary components and software naturally needs to be purchased separately, but we can recommend to use specialised NAS/Home Server software such as FreeNAS or Windows Home Server. Please note that there is no room for a 5,25-inch drive, we deliberately left this out since you don't generally use that in a NAS/Home Server environment, and it saved us a lot of space which we could use for fitting hard drives instead.

Click here for more info.