Shuttle OMNINAS K20 NAS Server Review

Storage/NAS by stefan @ 2012-10-08

The OMNINAS K20 from Shuttle is a product with decent performances in its class, that can be used for storing digital multimedia content, creating backups and also has additional services like Print Server, iTunes Server, BitTorrent downloader. The unit can house up to two 3.5'' drives that can be set up in JBOD, RAID 0 or RAID 1 configurations.

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Product Specifications

Product Features:


Budget-friendly NAS Server for Small Office, Workgroups and Home Use


Elegant ID design with solid 2.5mm aluminium for better heat dissipation


Dimensions: ca. 17 x 9 x 22.5 cm = 3.4 litres


Ultra-quiet operation - the fan activates only under heavy load/temperature


Two storage bays 8.9cm (3.5") support 2x 4TB+ hard disks Supports reliable RAID 1 mirroring with hot-swap function


Superior performance: up to 75/55 MB/s read/write


Power-saving with only 9W in standby, 15.5W in normal operation


USB 3.0 port and card reader - with Auto-Copy and share function 2x USB 2.0, Gigabit LAN (RJ45)


Accessable from Windows, Mac OS X and Linux workstations


Accessable from local network or internet (router required)


Anywhere data access from iOS and Android mobile devices


Supports DLNA/iTunes media server for audio/ video streaming


Scheduled Backup: NAS to USB, NAS to NAS


Scheduled BT downloads without requiring a PC


Integrated Printer Server



Product Specifications:





Robust, stylish 2.5 mm sandblasting aluminum combined with acrylic PMMA

Dimensions: 170 mm (H) x 90 mm (W) x 225 mm (L) = ca. 3.44 litres

Weight: 2.2 kg net (3.1 kg with two hard disks installed) / 2.8 kg gross

Kensington Security Slot at the back panel (also called a K-Slot or Kensington lock) as a part of an anti-theft system


Storage Bays


Two 8.9cm/3.5" storage bays (storage drives not included)Easy hard disk installation in two trays

Appropriate screws are includedEach bay with one hot swap button for RAID 1


Hard disk support and RAID levels


Supports two 8.9cm/3.5" SATA hard disk drives (each up to 4TB+)

Maximum total capacity of 8TB and beyond

Raid support: single disk, RAID 0, RAID 1 (hot swap), JBOD

Supports hard disk spin-down timer

Supports check/format disk, SMART information report, disk usage status report

Hard disks must support SMART temperature feature with temperature sensor




1x Gigabit LAN (RJ45, rear)

1x USB 3.0 (standard A, front), supports Auto-Copy function

2x USB 2.0 (type A, rear)

All USB ports support external devices like hard disks, flash drives, printers, digital camera, etc.

Memory can be shared to local network.


Card Reader


Built-in card reader in the front panel

Supports SD, SDHC and SDXC flash memory cards

Supports Auto-Copy function




Main power button with status LED

Two Omni Touch Hot Swap buttons (for HDD1, HDD2)

Reset button (hole, rear) for admin passwort reset


LED Indicators


Status LED: dual colour (access/error: blue/red)

HDD1/HDD2 LEDs: dual colour (access/error: blue/red)

USB 3.0 LED: single colour (access: blue)

Card reader LED: single colour (access: blue)

LAN speed LED (10/100 Mbps: green, 1000 Mbps: orange)

LAN Activity LED (access/link: blinking green)


Transfer Speed


Read data - from NAS to workstation: up to 75 MB/s [1]

Write data - from workstation to NAS: up to 55 MB/s [1]


LAN Configuration


Supports Static IP or Auto IP by DHCP server


Networking Services


Samba Server (SMB file sharing)

Apple File Protocol (AFP)

Media Server/DLNA compliant

iTunes Server

Printer Server (supports USB printers)

BT download without PC (scheduled)

External device sharing (via USB or card reader)

NTP support for scheduled time synchronization


APPs for mobile devices


Upload and share files from iOS and Android devices.(search for the appropriate "OMNINAS" app)


System Services


Firmware upgrade

Time-Zone settings

Factory reset function

System log report


Built-in Backup functions


Quick Auto Copy for external storage (USB 3.0 or card reader to NAS)

NAS to USB storage backup (scheduled or immediately)

NAS to NAS backup (scheduled or immediately)




Processor: PLX NAS 7821, Dual Core ARM 11, 2x 750 MHz

DRAM memory size: 256 MB DDR2


Operating System


Embedded Linux


Power Adapter


External 65 W AC/DC power adapter (fanless)

Input voltage: 100~240 V AC, 50~60 Hz

Automatic AC voltage adjustment

Input current: max. 1.6 A (1.0 A) for 100 V (240 V) input voltage

Output: 19 V DC, max. 3.42 ADC

Connector: 5.5/2.5 mm (outer/inner diameter)

Dimensions: 108 mm x 30 mm x 46.5 mm (without cable)


Cooling fan and temperature control


Ultra-quiet 80 mm cooling fan.

By default the fan is not activated under normal temperature conditions.

The following criteria depicts the system fan behavior dependend on the internal hard disks temperature:

up to 54 °C: fan is off

55~59 °C: fan rotates at low speed

60~61 °C: fan rotates at middle speed

62 °C and above: system shuts down

The System also shuts down when the system temperature exceeds 65 °C. [2]




Quick Installation Guide

AC Power adapter (65 W) with AC power cord (plug depends on region)

Ethernet cable, ca. 150 cm

Driver CDROM with NAS finder software and documentation

Screws for hard disk installation


System Requirements


- Workstation OS: MS Windows XP SP3, Mac OS X 10.4, Apple Safari 3.0, Linux kernel 2.6.x or later

- Smart phone OS: iOS 4.2, Android 2.3 or later

- Browser: MS Internet Explorer 7.0, Firefox 3.x, Google Chrome, Apple Safari 3.0 or later

- Router for Internet connection


Power Consumption

Standby mode: 9 W

Normal operation: 15.5 W

Maximum load: 21 W


Standby Mode


After a certain time of inactivity the system will enter power saving (standby) mode.

This time can be set under: Settings - General - Power Saving Time Setting

You can select a time from 10 min up to 5h.


Environmental Spec


Operating temperature range: 5~35 °C (41~95 °F)

Relative humidity range: 10~90% (non-condensing)




[1] depending on the test environment

[2] the threshold temperatures are subject to change by firmware update. The KD20's threshold temperature refers to the "Current internal temperature" provided by the SMART monitoring system. This temperature may be much higher than the "operating/ambient temperature" that is also mentioned in the hard disk specification. The KD20 only supports hard disks with SMART monitoring system and temperature sensor which all available SATA hard disks should support.

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Comment from Arvi Pingus @ 2012/10/22
'The BT Download and Media Server services cannot operate at the same time' is a no go for me.
Update firmware required or would mem be the problem NAS2 required.