- P10 jumper to disable eMMC, when this jumper close it means disable the eMMC device (open = enable eMMC),
- P11 jumper to disable SPI Flash, when this jumper is shorted/close it means disable the SPI Flash (open = enable SPI Flash),
- P13 jumper is the HS select, when this jumper closed the High Speed (USB 2.0) connection to the SoC will be establised, so you can use flashing technology such as rockusb and marskom.
[comment]: <> (its also called as HS select, when this jumper is closed the micro USB-C connector become type-C HS (open = console), your USB-C cable will connected to the serial console of the Helios64 board by default. By closing this connection the USB-C connection will become the HS mode, the eMMC will be detected as the USB Mass storage in your PC, in this configuration can directly flash the Armbian image to it.)
| Suspend-to-Ram | 7.2 W | 6.0 W | HDD in Standby mode |
!!! note
Measures were done using a Current Clamp Meter on the Helios4 12V DC input. AC Power consumption is calculated based on a AC/DC conversion efficiency of 85%.
* Meter tool : Extech 380942 - 30A True RMS AC/DC Mini Clamp
* AC/DC Adapter : yczx1268 (efficiency : 85%)
* AC Input Voltage: 220V
* HDD: 4x WD Red 2TB (WD20EFRX) configured as RAID10
We recommend HDD which are designed for NAS (Network Attached Storage). Those NAS HDD are specially conceived for reliable 24/7 operation and offers lower power consumption and dissipation, less vibration and noise, and finally better warranty. We recommend the following models :
**Western Digital** : WD Red NAS (1, 2, 3, 4, 6, 8 and 10TB)
- WD10EFRX
- WD20EFRX
- WD30EFRX
- WD40EFRX
- WD60EFRX
- WD80EFZX
- WD100EFAX
**Seagate** : IronWolf NAS (1, 2, 3, 4, 6, 8 and 10TB)
- ST1000VN002
- ST2000VN004
- ST3000VN007
- ST4000VN008
- ST6000VN0041
- ST8000VN0022
- ST10000VN0004
**HGST** : Deskstar NAS (4, 6 and 8TB)
- 0S04005
- 0S04007
- 0S04012
!!! note
We recommend to order from different shop to avoid having all the drives from the same factory batch. For instance, you should order 2x HDDs from one shop, then the 2 others from another shop.
## HDD / SSD Compability List
Please refer to [Synology DS416j Compatibility List](https://www.synology.com/en-global/compatibility?search_by=products&model=DS416j&category=hdds&p=1) that covers a large number of tested drives. The DS416j used the same SoC family than Helios4.