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@MSGID: 3:633/10 74a93645
@REPLY: 3:633/10 9a993920
@PID: PyGate 1.5.15
@TID: PyGate/Linux 1.5.15
@NOTE: Mozilla Thunderbird
@CHRS: CP437 2
@TZUTC: 0100
@REPLYADDR: Pancho.Jones@protonmail.com
@REPLYTO: 3:633/10 UUCP
@RFC-Message-ID: <10vm6ng$2qq82$1@dont-email.me>
On 6/1/26 10:35, John R Walliker wrote:
> On 31/05/2026 23:57, Pancho wrote:
>> On 5/29/26 04:42,
bp@www.zefox.net wrote:
>>> The Natural Philosopher <tnp@invalid.invalid> wrote:
>>>> On 28/05/2026 16:38, Mike Scott wrote:
>>>>> On 28/05/2026 16:27, Mike Scott wrote:
>>>>>> there seems to be no obvious fault with the ssd as such - it was
>>>>>> working as expected when put into storage, and a scan with
>>>>>> badblock -w
>>>>>> is currently at 80% with no errors.
>>>>>>
>>>>>
>>>>> I should add, the pi4 is running from the spinner, while checking the
>>>>> ssd. 89% checked, 0 errors as I write.
>>>>>
>>>>> Also, a second pi4 has the same issue, so it`s not a faulty pi4.
>>>>>
>>>> Some disks with some USB adapters simply do not work
>>>>
>>>
>>> Two thoughts:
>>>
>>> Try a different USB bridge on the SSD.
>>> Some behave better than others.
>>>
>>
>> +1
>>
>> My rpi4 UBS 3 sockets failed, I suspect due to feeding power back into
>> the port from a powered SATA to USB connector.
>>
>> The USB 2 ports still work fine.
>>
>> This USB failure was slow. USB 3failure started as occasional SSD
>> write errors, gradually becoming more regular.
>>
>> It took me a while to diagnose as the problem was intermittent and
>> there was nothing wrong with the disk itself.
>
>
> I would be surprised if the fault was caused by back powering. The
> superspeed signals are capacitor coupled. The client end of the
> connection does not transmit anything until the host has
> completed a probe operation to look for the correct termination
> resistance at the client end. Therefore there would never
> be any attempt at superspeed data transmission if the host was
> unpowered.
> John
>
I do not understand your comment. I do not understand the relevance of
super speed transmission, or possibly I don`t understand what the term
means. I don`t understand client/host.
For clarity, the back powering I observed was on powering down my rPi 4.
When I removed the standard rPi4 USB power supply the rPi4 would remain
powered on. The rPi4 would only power down when the USB/SATA adapter
power was disconnected. i.e. In this scenario the rPi4 was being powered
by a USB 3 data port.
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