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@MSGID: 3:633/10 e0742f47
@REPLY: 3:633/10 0e626ed8
@PID: PyGate 1.5.16
@TID: PyGate/Linux 1.5.16
@NOTE: Mozilla Thunderbird
@CHRS: ASCII 1
@TZUTC: 0100
@REPLYADDR: me@privacy.net
@REPLYTO: 3:633/10 UUCP
@RFC-Message-ID: <110hocf$2eom0$1@dont-email.me>
On 31/05/2026 23:57, Pancho wrote:
> My rpi4 UBS 3 sockets failed, I suspect due to feeding power back into
> the port from a powered SATA to USB connector.
I use a Pi for a PVR, recording TV programmes to a spinning USB HDD that
is connected to a powered USB hub (so the HDD is not being powered by
the Pi`s USB).
When I used a Pi3, this worked perfectly. When I switched to using a
Pi4, with the same HDD and hub, the Pi consistently hung very early in
the boot process. As soon as I unplugged the hub from the Pi (or removed
the hub`s PSU) the Pi continued the boot process. (*)
It was a problem mainly if there had been a power cut and the power to
both the Pi and the hub was turned on at the same time (when the power
came back).
Someone suggested back-powering might be the cause, so I made up a
special cable which had its +5V line cut and connected it between the Pi
and the hub. Sadly this made no difference.
Powering the HDD from the Pi`s power, via USB, worked fine - but I was
uneasy about drawing so much current from the Pi`s PSU in case the
voltage ever sagged to the point that the Pi started to misbehave.
I solved the problem by changing to use a SATA HDD in a caddy that had a
powered SATA-USB interface.
So the Pi4 seems to be more sensitive to powered devices than the Pi3.
I`m not sure about the Pi5 as I`ve only used USB-powered SD cards as
slave drives.
All of this is talking about an HDD that is used as a data disk. I still
boot off an SD card plugged into the Pi`s motherboard, in the standard way.
(*) I forget how far the boot got before it hung. It might have been
before there was *any* image on a monitor connected to the HDMI port,
which isn`t a great deal of help...
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* Origin: Dragon`s Lair, PyGate NNTP<>Fido Gate (3:633/10)
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