This model is implemented in a rather new case which was first introduced in Synology’s previous NAS generation. It is optimized for lower noisiness using rubber pads for HDDs and the front panel. The case measures 20x23.5x16.5 centimeters. Most of its exterior panels are made of black plastic but the rear panel is metallic.
The HDD bays are covered behind a glossy plastic panel but the rest is matte and practical. In the right part of the front panel we can see system and HDD indicators, a USB 2.0 port and a power button with an integrated LED.
HDDs are installed into frames which are compatible with both form-factors. The frames are then secured in the bays by means of plastic locks.
There are vent holes in the front, button and side panels, but we have some doubts whether this ventilation is sufficient, especially for the HDDs.
There are two 90mm fans at the back. The rear panel also offers a power connector, a Gigabit Ethernet port with indicators, an eSATA port, two USB 3.0 connectors and a hidden reset button. The eSATA interface can be used with Synology’s expansion modules to increase the number of supported HDDs (such modules come with a special cable with screw fasteners).
This case design is good and functional, although there is no button for copying data via USB and the front-panel USB port is only version 2.0. These are but minor compromises, though.
Users are not supposed to dismantle the NAS because HDDs are installed from the outside. There are no maintainable parts inside. However, if you want to have a closer look, you can take off the plastic casing to find a metallic chassis underneath. There are three PCBs attached to it: a main PCB, a backplane for HDDs, and an I/O unit with additional ports. They are connected via PCIe slots without flexible cables.
Synology has employed the PPC platform in its current line-up. It used to be installed in top-end NASes a few years ago but was later replaced with Intel's Atom. The Atom-based NAS from Synology will be discussed below.
The hardware platform has been improved since then. The Freescale QorIQ P1022 processor incorporates two e500 cores while its clock rate has remained at 1.067 MHz. The updated version of the chip features DDR3 support, so the DS413 is equipped with 1 gigabyte of DDR3 SDRAM. The flash memory is only used to install and boot up the OS, so its capacity is 8 MB only. The four SATA ports are based on a Marvell 88SX7042 chip. The CPU-integrated USB controller is only version 2.0. Therefore the two USB 3.0 ports are based on a NEC D720200 chip. The network controller works together with a Realtek RTL8211E chip.