AS251S - NAS ATEN - Free user manual and instructions
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| Brand | ATEN |
| Model | AS251S |
| Product Type | Network Attached Storage (NAS) |
| Number of Drive Bays | 2 |
| Compatible Drive Sizes | 3.5-inch and 2.5-inch SATA HDD/SSD |
| Processor | Quad-core 1.5 GHz |
| Memory | 2 GB DDR3 (upgradeable to 8 GB) |
| Network Interface | Gigabit Ethernet x 2 |
| USB Ports | USB 3.0 x 2, USB 2.0 x 2 |
| Dimensions (W x H x D) | 120 x 90 x 220 mm |
| Weight | 1.5 kg without drives |
| Power Supply | External 60 W adapter |
| Max Power Consumption | 35 W in operation, 8 W in sleep mode |
| Cooling | 1 x 80 mm quiet fan |
| Supported RAID Modes | RAID 0, 1, JBOD |
| File System | EXT4, Btrfs |
| Management Interface | Web-based (HTML5) with mobile apps |
| Security | Encrypted network access (SSL/TLS), user and group management |
| Languages Supported | Multiple languages including English, French, German, Spanish |
| Operating Temperature | 0 to 40 degrees Celsius |
| Storage Capacity | Up to 36 TB (2 x 18 TB drives) |
| Backup Features | Snapshot, rsync, cloud backup |
| Maintenance | Keep ventilation holes clear, clean dust with dry cloth |
| Safety | Use grounded power outlet, avoid liquid exposure |
| Spare Parts and Repairability | No user-serviceable parts; contact ATEN support for replacements |
| Warranty | 2 years limited warranty |
Frequently Asked Questions - AS251S ATEN
How do I install hard drives in the ATEN AS251S?
Open the front drive bay door, slide the drive caddy out, secure your 3.5-inch or 2.5-inch SATA drive to the caddy using screws, then push the caddy back in until it clicks. Reconnect the power and network cable.
What RAID modes are supported and which should I choose?
The AS251S supports RAID 0 for striping (faster but no redundancy), RAID 1 for mirroring (data safety), and JBOD for spanning drives. For critical data, choose RAID 1.
How can I access the NAS from my network?
Connect the NAS to your router via Ethernet, power it on, and use the bundled installer to find its IP address. Then open a web browser, enter http://
What should I do if I forget the administrator password?
There is a reset button on the back panel. Press and hold it for 3 seconds to restore the default username and password. This will also reset network settings.
Can I stream media directly to a TV or smartphone?
Yes, the AS251S includes DLNA Media Server and supports streaming apps via the mobile ATEN MyShare application. You can play photos, music, and videos on compatible devices.
How do I update the firmware?
In the web management interface, go to System, select Firmware Update, and click Check for Updates. The NAS will download and install the latest version automatically. Ensure a stable network connection.
What is the default IP address of the NAS?
The default IP is assigned by your router via DHCP. Use the ATEN installer tool to discover the current IP address, or try the default static IP 169.254.100.100 if in direct connection mode.
How can I back up my data from a Windows PC?
Install the provided ATEN Sync software on your computer. It allows you to schedule one-way or two-way backups to the NAS. You can also use rsync over SSH for additional flexibility.
Does the AS251S work with Apple Time Machine?
Yes, the NAS supports Time Machine for macOS. Enable it under File Services, select the folder for Time Machine backups, and your Mac will automatically detect it and use it as the backup destination.
How do I create user accounts and set permissions?
In the management interface, go to Users & Groups. You can create users, assign them to groups, and specify read/write permissions for shared folders. Use ACLs for advanced access control.
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USER MANUAL AS251S ATEN
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Product information
Brand : ATEN
Model : AS251S
Category : NAS