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<div class="moz-cite-prefix">On 6/12/22 03:09, Christoph Schmees
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:ba458cc9-9d0d-8cb4-c50d-5b0ddbf1aaa6@pc-fluesterer.info">Am
12.06.22 um 05:10 schrieb Jeffrey Taylor:
<br>
<blockquote type="cite">I have a Verbatim external USB 3.0 hard
drive. For the second time in a month, my laptop running Leap
15.3, fails to recognize when it's plugged in. The light on the
drive lights up when it's plugged in, sothe drive recognizes the
laptop. The laptop is a Lenovo T520. The ports are USB 2.0.
Rebooting the laptop does not help. Shutting the laptop for an
hour does help. Any of this sound familiar? Is USB port
failing? Probably not, same thing happens regardless of which
port the hard drive is plugged into. Hard drive failing or
something in the kernel messing up?
<br>
<br>
</blockquote>
<br>
IMHO neither nor. My best guess is: USB3 device is allowed nearly
twice the current of USB2. That may physically overload the USB2
HW in the laptop. That can even lead to permanent damage to the HW
- BTDT. For my X220 I use an Express-Card USB3 adapter. That
fetches extra current via an USB cable to be plugged into one of
the USB2.
<br>
If I were you I would stop experiments with USB3 device in USB2
output. Instead of the Express-Card you could use an USB3 hub with
*external* power. And make sure that power is working! One of my
customers failed to do so. The hub and connected devices drew all
current from the poor laptop. Result: USB2 fried.
<br>
<br>
hth
<br>
Christoph
<br>
<br>
</blockquote>
<p>The hard drive has an external power supply. Just to check that
the drive is not pulling power from the USB2 port, I unplugged the
drive power supply (wall wart) and plugged it in. Its light
didn't light up and nothing appeared in the system journal
("journalctl -f").</p>
<p>Thank you for the suggestion,<br>
Jeffrey<br>
</p>
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