As hard disk drives must be installed into the NASes, any user can take a look at their internals without losing the warranty. The NASes run on similar platforms: a Marvell 88F6281 processor at 800 MHz, one 128MB system memory chip from Elpida, a 4MB boot-up flash memory chip, and a USB hub. The processor has only two SATA channels, so the DS410j additionally has an onboard 4-port SATA controller 88SX7042 that is connected to the processor’s PCI Express port. Interestingly, the DS210j has an external network adapter 88E8071 connected to that PCI Express interface whereas the DS410j goes along with the processor’s integrated network adapter.
There is a console port on the PCB but it can hardly be of any use since both NASes support ssh access. The DS210j has a robust metallic chassis the PCB, disks and fan are all fastened to. The DS410j is designed in a similar way except that the hard disks are installed into their bays on special frames and there is a second small card with the front indicators and On/Off button.
The cooling systems differ somewhat. The DS210j has one 70x25mm fan (Evercool EC7025L12ER) whereas the DS410j has a couple of 80x25mm fans (Sunon KDE1208PKV3).
The devices were overall rather quiet with our disks in the default mode. Switching the fans into the reduced-speed 2.5” mode and choosing quiet HDDs will help you make these NASes almost completely silent. The fan speed is automatically adjusted depending on the temperature.