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@MSGID: 3:633/10 d32a2441
@REPLY: 3:633/10 1a9e1bae
@PID: PyGate 1.5.15
@TID: PyGate/Linux 1.5.15
@NOTE: Mozilla Thunderbird
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@REPLYADDR: usenet.16@scottsonline.org.uk.invalid
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On 29/05/2026 09:19, Richard Kettlewell wrote:
> Mike Scott <
usenet.16@scottsonline.org.uk.invalid> writes:
>> Richard Kettlewell wrote:
>>> Mike Scott <usenet.16@scottsonline.org.uk.invalid> writes:
>>>> Hi all. I always seem to get impossible problems....
>>>>
>>>> Take a pi4 and two disks - both sata connected by a sata to usb
>>>> adapter. One is a small real disk drive, the other a Kingston
>>>> SSD. Both have been in the spares cupboard for a while.
>>>>
>>>> I put an old arm64 version of bookworm onto the spinner. Works fine.
>>>>
>>>> I put the exact same onto the ssd. Won`t boot, with messages like
>>>> timed out waiting for udev to be empty
>>>> or
>>>> read error on /dev/sda [details not recorded]
>>>
>>> Boot the Pi from the spinning disk (or an SD card) and connect the
>>> SSD to the Pi. See if you can access it and if not, have a look at
>>> the kernel log.
>>
>> Already did - I ran one full pass with baddisk -w which completed with
>> zero errors.
>
> Never heard of baddisk, what is that?
My bad - I meant `badblocks`.
>
> Anyway from what you?ve said, Linux on the Pi can?t see the SSD during
> early boot, but can see it when attached to the Pi later. That?s hard to
> explain, since it?s the same hardware and the same code looking for it
> in each case.
>
> Just to check, did you run your ?full pass with baddisk? _on the Pi_, as
> requested above?
Yes.
The problem does look as though it was down to a combo of the ssd plus
one particular sata/usb adapter (I have 3). Using dd, I found transfer
rates down to <10MB with the ssd and that particular adapter.
The issue does seem to centre around the combo of ssd, that particular
adapter, and the pi4. I get decent transfer rates using my desktop with
all the adapters; just the pi4 has issues with that one, fine with the
other 2.
Anyway, I have a system that has now booted several times without issue,
which is great.
Thanks to all for commenting.
>
--
Mike Scott
Harlow, England
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