PCIE SATA controller ASM1062 problems or software

[vecnar]

I did a continuity test between sbc mounting bolts and hdd case and it is good.

Have you a network analyzer up to GHz range? The noise that can disturb SATA operation is high frequency. And usual continuity testers doesn't work at high frequencies. They are DC usually and can't help gere.

There are mounting posts in the nas case that you screw sbc to. See below youtube video and forward to 1 minute.
https://www.youtube.com/watch?v=_UeeklKo0Og

The case has metal mounting posts. But has the SBC a metal contacts at these posts? Have the case posts an electric contact with SBC ground? 

As i tried with single hard drive and still get the same issues it has to do something with timing for drive to spinup. 
What you listed regarding ground may help with errors during copying of the files but looking at it as none electronics specialist, connector that has 4 pins on pcb close to dc jack feeds the drives with power, yes there is a converter of some type in between to reduce 12v to 5v or 3v but i would think ground should be solid.

I can't say about the timings.
Saying about good contacts you're saying about a DC path. Yes, it is good. But long black wires of DC supply can't forward high frequency energy good enough. Additional contacts are needed. That is why the motherboard in generic PC is screwed by many screws and the mounting holes of PCB are metalized.

Anyway try to place a link between SATA controller board screw and an RJ-45 shield just to check will it change something. Also place SATA cables togeter with power that manner the look like a common single cable.

If nothing above helps, the problem is definitely a software problem

Hello Nikolay,
By continuity i meant small resistance i had on my multimeter which was done when everything was off. I do not have network analyzer.


Sbc doesn't have metal contacts on where screws attach. The only link between case and sbc was pcie bracket screw. So the link between sbc and hdd cages is through power cables, sata cables and sata controller mounting bracket.

Strangely enough today i didn't have problems when writing to disks, i only had problems on first startup when power is connected first time and even one reboot didn't fix at times, possibly because i removed hdd cage and all cables where moved. Write speeds were from disk to disk were from 40-60 MB/s on large files.
While i had it opened i changed sata cables that i had laying around, they looked a bit old with 90 degrees angle on one side (sata cables have to be bent close to contact points in the case on both sides). I also connected sata screw to a wire and wire to ground cable that feeds one of the drives (it is connected to ground pin on pcb).

You mentioned putting sata cables and power cables in one bunch but is it really a good idea to put power cables that have converter in them with data cables? Or should I place them as far apart as possible as it has voltage converter behind shrink wrap?


Sometimes when unplugging power plug from socket and holding power button to discharge the current didn't help to reproduce the problem, I assume it is because some current is stored in capacitors as leaving it for longer and coming back is reproducible.

I think i have armbian on another sd card that i will try and see if i get the same results.