Troubleshooting • Re: Externally powered SSD doesn't work well on RPI4

If you are using quirks with a SSD, it probably won't be trimmed and you will risk wearing out the SSD faster.

Your wifi blanking is caused by RF radiation from the USB3 cable, hence my suggestion of using ferrite clamps. Your split cable probably aggravates this more. You could try shielding it with silver foil as an experiment to see if there is some improvement. Ideally the USB cables should be twisted pairs and fully shielded, quite often they aren't because the cables end up too stiff, the ferrite clamps help reduce any inadequacies by ensuring only balanced signals get past them, balanced signals radiate far less.

Some powered hubs don't work well because of back-powering issues with the Pi, I have a RSHTech 4 port which works well though it would have been better if it had come with a bigger power supply, eg I doubt it would cope with four SSDs.

Well, guess what? Take a look at this foolish abomination And you know what? It (doesn't) work like a charm, but at least it works!welp it doesn't work as if I didn't have it connected, but the connection is now stable even after I mounted a partition. Even a r/w process can remain semi-stable like you see in the screenshot!

Sometimes I cannot believe such issue was related to signal but welp, I guess I have to either get 4 new *interfere proof USB3 to SATA adapters* ( am i right? or else idk how i can make sure its signal line is twisted pair), or put ferrite clamps at the head and bottom of USB3 cable on each of my interfering adapters(do i need them for sata extension cable and power line, and also USB3.0 hub maybe?).

And well, if I can't get UAS(or UASP?) certified adaptors I'll have to be using 3.5' HDDs + non-powered usb3 hub for my syncthing file syncing solution.(only 1~2 disk will be in use in any situation so it should be fine I guess)
My budget only allows me to go with HDD if I wanna go with higher quality connectors. But your last quote made me thought, I know that if I use external power supply, 4 SSD should take 0.36A at peak time, plus the back-powering issue you just mentioned and taking 0.8A from RPI4 won't cause any issue, do I still need to consider powered hub? I mean, for SATA works, having a powered hub seems to be unnecessary for now. or am I wrong?

Statistics: Posted by fredtt696 — Sat Apr 27, 2024 10:48 pm

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