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+## Ethernet
+
+The ethernet port is located at the back of helios 64 device:
+
+![Eth Location](/helios64/img/ethernet/eth-back.jpg)
+
+There are 2 ethernet port in the backplate of Helios64:
+
+![Eth Description](/helios64/img/ethernet/eth-backplate-labeled.jpg)
+
+The 1Gbps ethernet interface is supported by RTL8211F chipset which connected to RK3399 by RGMII.
+Theoretically this interface support 1G bit per second transfer rate, by default configured as full duplex and support wake on LAN (WoL) featue.
+In the manufacturing process, even mac address was assigned to this interface (e.g. 64:62:66:d0:00:00)
+
+The second interface rated at 2.5Gbps, this interface use RTL8156 controller.
+The 2.5 Giga bit per second interface is connected to RK3399 via [USB 3.0 Hub](/helios64/usb/#usb-on-helios64).
+This interface support full duplex communication and also wake on lan (WoL).
+Odd number was choosen as the mac address of this interface (e.g. 64:62:66:d0:00:01)
+
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diff --git a/docs/helios64/sata.md b/docs/helios64/sata.md
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+## Serial ATA (SATA)
+
+Helios64 use the JMicron JMB585 controller, this controller support up to 5 port SATA devices.
+The SATA controller support following features: 
+
+- 5 SATA ports,
+- command-based and FIS-based for Port Multiplier,
+- compliance with SATA Specification Revision 3.2,
+- AHCI mode and IDE programming interface,
+- Native Command Queue (NCQ),
+- SATA link power saving mode (partial and slumber),
+- SATA plug-in detection capable,
+- drive power control and staggered spin-up,
+- SATA Partial / Slumber power management state.
+
+the SATA Controller is connected to the PCIe port in RK3399, the PCIe bus is compatible with PCI Express Base Specification Revision 2.1.
+Bandwidth of this PCIe is 5GT/s.
+
+Following graphics is showing the mux diagram of the SATA Controller:
+
+bikin diagram mux (multiplexer) seperti di USB (/helios64/usb/#usb-type-c-functionality-on-helios64)
+
+The power delivery of the SATA Controller is devided into two group, this power control scenario is performed to reduce the inrush current when all the HDDs turned on simultaneously. 
+The 8 Pin MOLEX connector for the SATA Connector is devided into two group. The first group will power on 3 HDDs in the initial stage, and the second group will power on another 2 HDDs later. 
+
+disebelah connector battery ada MOLEX 8 pin klo ga salah. itu nanti pake kabel khusus biar keluar jadi MOLEX yg SATA
+grup 1 aktif duluan, nyalain 3 HDD. nanti beberapa saat kemudian grup 2 aktif buat nyalain sisanya (2 HDD)
diff --git a/mkdocs.yml b/mkdocs.yml
index 841070d..e8d35c4 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -78,6 +78,7 @@ nav:
     - Overview : 'helios64/hardware.md'
     - Battery : 'helios64/battery.md'
     - Button : 'helios64/button.md'
+    - Ethernet : 'helios64/ethernet.md'
     - Front Panel (P3): 'helios64/front-panel.md'
     - GPIO (P5): 'helios64/gpio.md'
     - I2C : 'helios64/i2c.md'
@@ -85,6 +86,7 @@ nav:
     - LED : 'helios64/led.md'
     - M2 Connector (J2): 'helios64/m2.md'
     - PWM Fan : 'helios64/fan.md'
+    - SATA : 'helios64/sata.md'
     - SPI : 'helios64/spi.md'
     - UEXT Connector (P2): 'helios64/uext.md'
     - USB : 'helios64/usb.md'