If you are looking for a small, quiet, NAS device that takes 2.5” hard drives, then take a look at the Synology DiskStation DS409slim.
Here is how Synology describe the DS409slim:
Synology Disk Station DS409slim is designed to provide users with a budget-friendly solution for easy file sharing and backup. The snap-in 2.5″ hard drive design brings low power consumption, quiet operation, reliability and easy disk replacement in a compact design. Its sophisticated software, Synology DiskStation Manager 2.3, delivers ease of use and variety of features.
Here is so more information on the capabilities of the DS409slim from the Synology website:
Green, Quiet, and Reliable
The DS409slim is designed to work with 2.5″ hard drives. The low power consumption characteristic of 2.5″ hard drives will lower your electricity bill, as well as reduce your carbon footprint.
The smart fan design keeps the DS409slim’s fan off under normal operations and spinning up at a very low speed only when needed, thus minimizing the noise level.
In addition, 2.5″ hard drives have reduced vibration, increased MTBF (mean time before failure), and shock tolerance. It not only extends hard drive’s lifespan, but also provides better reliability.
Multimedia & Entertainment
Synology Download Station 2 functions as a 24×7 BitTorrent, FTP, HTTP, eMule, and NZB download center. The newly-integrated eMule download engine allows search-n-download capability with a web-browser without installing additional desktop applications.
Synology Audio Station supports music, Internet radio stations, and iPod playback with connected USB speakers. An optional direction-free Synology Remote allows you to freely enjoy your music. Web-streaming mode allows your music to be shared with multiple users over the Internet.
UPnP support allows users to stream multimedia files with an UPnP Digital Media Adapter (DMA) on a stereo system or a TV-set. Sony PS3 and Microsoft Xbox360 are also supported.
iTunes Server is an easy way to share music to other iTunes clients over the network. Password protection prevents unauthorized sharing.
Easy Storage & Backup
USBCopy provides a plug-n-save solution to store data. With just one touch on the Copy button, it quickly backs up the data on an USB storage device to the pre-defined location on the Synology Disk Station.
Synology Data Replicator 3 allows Windows users to back up desktop data to the Synology Disk Station. Immediate, Sync, and Scheduled Backup are fully-supported.
The Network Recycle Bin ensures all deleted files are recoverable from the recycle bin.
Eco Friendly
Synology Disk Station is designed and developed perpetually with the concept of energy saving.
Compared with average PC counterparts, Synology Disk Station consumes a relatively low amount of power and has the HDDs hibernate when not in use. This not only helps to save energy but also extends the lifespan of the hard disk.
Synology Disk Station truly earns the title of “green product” because of the unique Scheduled Power On/Off feature, and the smart fan design effectively cools down the system with minimum power consumption, yet keeps the system quiet on operation.
Finally, all Synology products are produced with RoHS compliant parts and packed with recyclable packing materials. Synology recognizes its responsibility as a global citizen and is continually working to reduce the environmental impact of the products we create.
SPECIFICATIONS
The DS409slim is a very small device indeed. It has four removable drive bays at the rear, along with an Ethernet port, eSata port and USB port, plus the power connector.



The front of the DS409slim also houses a USB port, plus status lights.

Here are the complete specifications:
Hardware
- CPU Frequency: 1.2GHz
- Hardware Encryption Engine
- Memory Bus: 16bit@DDR800
- Memory: 128MB
- Internal HDD1: 2.5″ SATA(II)/SSD X4
- Max Internal Capacity: 3TB (4x 750GB hard drives)*
(See All Supported HDD)
- Size (HxWxD): 120mm X 105mm X 142mm
- External HDD Interface: USB 2.0 port X2, eSATA port X1
- Weight: 0.66kg
- LAN: Gigabit X1
- Wireless Support
- Noise Level (fan-only):2 24dB(A)
- Power Recovery
- AC Input Power Voltage: 100V to 240V
- Power Frequency: 50Hz to 60Hz, Single Phase
- Power Consumption:3 19W(Access); 12W(HDD Hibernation)
- Operating Temperature: 5°C to 35°C (40°F to 95°F)
- Storage Temperature: -10°C to 70°C (15°F to 155°F)
- Relative Humidity: 5% to 95%RH
- Maximum Operating Altitude: 10,000 feet
- Certification: FCC Class B, CE Class B, BSMI Class B
Applications
File Station 3
FTP Server
- Bandwidth Control
- Custom FTP Passive Port Range
- Anonymous FTP
- Transfer Log
Web Station
- Virtual Host (up to 30 websites)
- PHP/MySQL
- Alternative HTTP Error Page
- 3rd-Party Applications Support
Surveillance Station 4
Photo Station 4
- Supported Image Format: BMP, JPG (jpe, jpeg), GIF, RAW (arw, srf, sr2, dcr, k25, kdc, cr2, crw, nef, mrw, ptx, pef, raf, 3fr, erf, mef, mos, orf, rw2, dng, x3f)
- Supported Video Format: 3G2, 3GP, ASF, AVI, DAT, DivX, FLV, M4V, MOV, MP4, MPEG, MPG, QT, WMV, XviD, RM5, RMVB5, VOB5, RV305, RV405, AC35, AMR5, WMA35
Download Station 2
- Supported Download Protocols: BT/HTTP/FTP/NZB/eMule
- Custom BitTorrent Port Range
- BitTorrent / eMule Bandwidth Control
Audio Station 2
- Supported Audio Format: (USB Mode) AAC, FLAC, M4A, MP3, Ogg Vorbis, WMA, WMA VBR; (Streaming Mode) MP3, M4A, M4B
- Supported Playlist Format: M3U, WPL
- Internet Radio: SHOUTcast, Radioio
DLNA/UPnP Media Server
- PS3/Xbox 360 Support
- Supported Audio Format: AAC, FLAC, M4A, MP3, Ogg Vorbis, PCM, WAV, WMA, WMA VBR, WMA PRO, WMA Lossless
- Supported Video Format: 3GP, 3G2, ASF, AVI, DAT, DivX, DVR-MS, ISO, M2T, M2TS, M4V, MKV, MP4, MPEG1, MPEG2, MPEG4, MTS, MOV, QT, SWF, TP, TRP, TS, VOB, WMV, XviD
- Supported Image Format: BMP, JPG (jpe, jpeg), GIF, ICO, PNG, PSD, TIF (tiff), UFO
- Supported Subtitles Format: srt, psb, smi, ass, ssa, sub, idx, ifo
iTunes Server
- Supported Audio Format: MP3, M4A, M4P, WAV6, AIF6
- Supported Video Format: M4V, MOV, MP4
- Supported Playlist Format: M3U, WPL
Printer Server7
- Max Printer #: 2
- Printing Protocols: LPR, CIFS, AppleTalk
Synology Packages
- SqueezeCenter
- Mail Station
- Webalizer
- phpMyAdmin
iPhone Applications