[ltp] External hard drive failing?

[Christoph Schmees]

Am 12.06.22 um 05:10 schrieb Jeffrey Taylor:
> 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?
> 

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.
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.

hth
Christoph

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