Re: crazy problem with pi4 and ssd

From	NY <me@privacy.net>
Newsgroups	comp.sys.raspberry-pi
Subject	Re: crazy problem with pi4 and ssd
Date	2026-06-12 20:58 +0100
Organization	A noiseless patient Spider
Message-ID	<110hocf$2eom0$1@dont-email.me> (permalink)
References	<10v9mss$3hj00$1@dont-email.me> <10v9nho$3huh4$1@dont-email.me> <10v9o2j$3htdc$3@dont-email.me> <10vb201$3sndh$2@dont-email.me> <10viec2$1rsv5$1@dont-email.me>

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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...

Thread

crazy problem with pi4 and ssd Mike Scott <usenet.16@scottsonline.org.uk.invalid> - 2026-05-28 16:27 +0100
  Re: crazy problem with pi4 and ssd Mike Scott <usenet.16@scottsonline.org.uk.invalid> - 2026-05-28 16:38 +0100
    Re: crazy problem with pi4 and ssd The Natural Philosopher <tnp@invalid.invalid> - 2026-05-28 16:47 +0100
      Re: crazy problem with pi4 and ssd bp@www.zefox.net - 2026-05-29 03:42 +0000
        Re: crazy problem with pi4 and ssd Pancho <Pancho.Jones@protonmail.com> - 2026-05-31 23:57 +0100
          Re: crazy problem with pi4 and ssd John R Walliker <jrwalliker@gmail.com> - 2026-06-01 10:35 +0100
            Re: crazy problem with pi4 and ssd Pancho <Pancho.Jones@protonmail.com> - 2026-06-02 10:11 +0100
          Re: crazy problem with pi4 and ssd NY <me@privacy.net> - 2026-06-12 20:58 +0100
            Re: crazy problem with pi4 and ssd Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-06-13 02:55 +0000
              Re: crazy problem with pi4 and ssd NY <me@privacy.net> - 2026-06-13 23:40 +0100
                Re: crazy problem with pi4 and ssd Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-06-14 05:34 +0000
  Re: crazy problem with pi4 and ssd Richard Kettlewell <invalid@invalid.invalid> - 2026-05-28 17:39 +0100
    Re: crazy problem with pi4 and ssd Mike Scott <usenet.16@scottsonline.org.uk.invalid> - 2026-05-28 21:30 +0100
      Re: crazy problem with pi4 and ssd Chris Townley <news@cct-net.co.uk> - 2026-05-28 23:15 +0100
      Re: crazy problem with pi4 and ssd Richard Kettlewell <invalid@invalid.invalid> - 2026-05-29 09:19 +0100
        (resolved) Re: crazy problem with pi4 and ssd Mike Scott <usenet.16@scottsonline.org.uk.invalid> - 2026-05-29 12:57 +0100
          Re: (resolved) Re: crazy problem with pi4 and ssd Daniel James <daniel@me.invalid> - 2026-05-29 15:41 +0100
          Re: (resolved) Re: crazy problem with pi4 and ssd Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-05-29 23:30 +0000
  Re: crazy problem with pi4 and ssd pitter_smith <70620b9261c622c2c6443cb36988dd78336be458fd9f13499dd358523b105d91@example.com> - 2026-06-15 20:45 +0000

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