A Look Inside

Taking this NAS apart is not so easy. I had to deal with lots of screws, and you need to apply some force to remove the plastic cover.


The main body is made out of metal, while the enclosure is made out of plastic. The server consists of three PCBs, the main one and two PCIe cards. The mainboard has many similarities with the mainboard of the DS920+ since both servers use the same CPU.


The mainboard is small, and a heatsink covers the SoC. There is no active cooling for the latter.


There are three VRMs close to the CPU socket area. Two of these most likely power the CPU, and the third handles the system memory. Mostly, solid tantalum surface mount caps are used for filtering and energy storage. Power management is handled by a Richtek RT5077A.


Two AP4435GM FETs are installed right next to an SK34C schottky barrier diode (SBR).


On the other side of the mainboard, we have the PCIe ports, USB 3.0 header, and RAM, which is soldered to the mainboard,


The single RAM slot is occupied by a 4 GB DDR4 2666 MHz SODIMM.


The mainboard's BIOS chip is a Winbond 25Q128FWSQ. There is also a Macronix MX30LF1G18AC-TI 1 Gbit NAND flash memory chip on board, and its controller is a Phison PS2251-68.


The PCIe card that hosts all four Ethernet ports can also take up to two M.2 drives. On it, I found a PCIe clock buffer IC (ICS 9BD403DGLF), Winbond 25X20CLNIG flash memory chip, and four Realtek RTL8111HS Gigabit Ethernet controllers.


The SATA controllers are by Marvell, and their model numbers are 88SE9235 and 88SE9170.


The SATA expansion card can host up to five drives.


A PCIe bridge controller by ASMedia.


An 8-bit microcontroller by PIC—its model number is PIC16F18345. It most likely handles the server's LED indicators.


Next to the buzzer are a coil (marked R47), two solid tantalum caps, a bunch of MLCC caps, and a Vishay SiC632 integrated power stage.


An Altera complex programmable logic device (CPLD).


A 4410 MOSFET is installed right below a Vishay tantalum cap.


The rear side I/O ports of the mainboard.


Y.S. Tech provides the two 92 mm diameter fans. Their model number is FD129225LL-N (12 V, 0.12 A, 1900 RPM, and 36.3 CFM). According to Y.S Tech, these fans use Sintetico bearings, which look to be of high quality and will easily outlive any plain sleeve bearing.