Now it’s time to take a look at the electronic components of the TS-S402. Dismantling its case proved to be a daunting task. There are so many screws and things that I was really tired when I finally took the PCB out.
The PCB is almost as large as the bottom of the case. The connectors, indicators and components we are interested in are all located on its top side. The cables that connect HDDs with the PCB are fastened in a funny way: the connectors are standard and almost identical on both sides of each cable, but besides being just plugged into the PCB’s headers, they are additionally covered with glue, obviously for more reliability. This is another indication of the rather unhandy method of connecting HDDs implemented in the TS-S402. Otherwise, the PCB is quite good overall.
The TS-S402 is based on Marvell’s SoC controller 88F5182 which comes from the Orion series.
This series is quite popular among manufactures of SOHO products and I have seen such chips in many other devices. Besides various controllers (SATA, Gigabit Ethernet, PCI Express, PCI, etc), the 88F5182 incorporates a Feroceon processor core based on ARM9 architecture and equipped with 32KB of cache. Besides the processor, the integrated SATA and USB controllers are employed by the NAS.
The TS-S402’s LAN port is based on a popular Marvell 88E1118 chip which can often be found not only in network devices but also in mainboards.
The obvious shortcoming of the hardware configuration of this NAS is its small amount of system memory. The PCB carries only 32 megabytes of memory in two A3S56D40ETP chips from PSC. This amount is typical of routers rather than of NASes. You’ll see below how this parameter affects the performance of the device.
The bootloader and some firmware code necessary for device initialization are stored in a 29LV320C chip from Macronix. It is a 4MB piece of flash memory.
The last detail to be noted is the system console port. It is a real connector ready for use. Judging by the number of pins, all of the NAS’s auxiliary interfaces are available through it.