On Thu, 17 Dec 2020 at 10:10, Frederic Muller <fred@xxxxxxxx> wrote:
On 12/17/20 8:38 PM, Frederic Muller wrote:
> On 12/17/20 7:23 PM, George N. White III wrote:
>> We need more data. Have a look at
>> https://www.smartmontools.org/ticket/594?cversion=0&cnum_hist=7
>> <https://www.smartmontools.org/ticket/594?cversion=0&cnum_hist=7>.
>> Bargain USB enclosures are often junk. If they are powered by the
>> USB port they often draw excessive
>> power leading to erratic behaviour. USB3 uses frequencies that often
>> cause RF interference with other
>> devices, bluetooth, etc. so need careful attention to shielding and
>> may be susceptible to RF interference
>> if there are RF sources nearby.
>>
>> 1. does smartmontools recognize the device?
>> 2. can you transfer the disk to another known good system/enclosure
>> for testing?
>> 3. are you using a limited power PC (RPi, laptop, etc.)?
>> 4. does the external drive+enclosure work using a USB2 port?
>> 5. does the enclosure have its own power source or is it powered
>> from USB?
> Wow... what a great answer! Thank you very much.
>
> So
> 1. smartctl failed: No such device
> 2. I could... maybe ...there is a sticker voiding the warranty if I
> open the case. I do have another (very old) great case, or at least it
> used to be. So once my warranty claim is sorted out I can do that.
> Just not right now. And maybe the other case got old (just like me)
Old cases vary widely in quality, some were very robust. It is getting
harder to find robust newer cases as market has been flooded with
cheap versions. I'm retired now, but at my former work we had
dozens of LaCie external drives with zero failures even years
after warranty expired (some of the drives did have to be replaced).
> 3. It's currently plugged to a Thinkpad X1 3rd gen but I actually want
> to plug it to a rpi...
RPi cases are rarely shielded, so RFI from USB3 can be an issue. Some
power supplies used with RPi may not support high external USB loads.
> 4. I have a USB hub 2.0 connected to the machine with my 512 logitech
> keyboard and it stops at detection and reset high-speed USB device
> number 8 using xhci_hcd. So I guess it doesn't work?
Does the USB hub have its own power supply? I use a USB2 hub with
external power to isolate USB2 devices (mouse, keyboard, old Android
phones) from the USB3 external drive (without it I get random keyboard
resets).
> 5. Powered by USB only.
>
> Now the disk was indeed super cheap. Do you mean that if I get a good
> case I could just plug it and be happy? Would I need an extra power
> supply as well considering I intend to plug it in a rpi?
>
> Thank you so very much.
>
> Fred
> _______________________________________________
>
I'll add one thing which may be important. I have an old(er) disk which
I plugged in this old casing and connected it to the rpi: stopped
working very quickly. I plug it into my X1 and no problem. So I thought
the disk/enclosure was old. Maybe now I'm thinking it could be power
requirements? The old casing has a "hole" to add an extra power supply
so maybe it would work just fine with it.
What's your take on this?
External power is recommended with RPi -- you might get away without
external power using a solid-state drive, but risky if the drive has a motor.
I generally try to buy external devices with good spec sheets that tell me
the power requirements, but for flea-market gear there are USB meters that
measure voltage and current (Klein ET920 USB Digital Meter, USB-A and USB-C).
Thank you.
You are very welcome and good luck.
George N. White III
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