my NTFS external HDD, not seen by desktop, but is by laptop

[Stephen Constantinou]

Dear All

Nils has cracked it.

The laptop has 2 x USB 2 slots and 1 x USB 3 slot.  I had been putting
the ext HDD into the USB 3 slot. So I put it in each of the USB 2 slots
and it worked.

I went back to the PC.  The rear of which has many USB slots.  I
attached it to several other slots (which I think are USB 2) and it worked.

The lesson is not to assume that all USB slots work.  That same slot
will see my memory stick but not this power hungry large HDD.  An
experiment I could have/should have done.

Thank you Nils

Best wishes to all

Stephen in London where it is still cold

On 16/03/2025 05:48, Nils Kassube via ubuntu-users wrote:
> On 15.03.25 Stephen Constantinou via ubuntu-users wrote:
>> I have the same version of Kubuntu on a laptop and desktop.  A new
>> external HDD (SATA, but not SDD), that connects via USB, is seen by the
>> laptop but not the desktop.  I can read and write to it when connected
>> to the laptop.  I cannot do this on the desktop, and Dolphin does not
>> list it as a Removable Device.
>
>> LSUSB
>> With the USB external HDD connected to the laptop, I tried the above
>> command and got the following output
>
>> Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
>> Bus 004 Device 003: ID 1f75:0621 Innostor Technology Corporation IS621
>> SATA Storage Controller [this is the external caddie that holds my HDD]
>
>> With the USB external HDD connected to the desktop, I tried the command
>> again and got the following output
>
>> Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
>> Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
>
> So you have USB2 and USB3 ports on both machines and the disk is connected via USB3 on the laptop. How about the desktop? Is the disk connected to a USB2 port or to a USB3 port? If you connect it to USB2 you may not care about the lower transfer speed but the issue could be the power. UBS3 can deliver significantly more power and the disk may require USB3 for this reason.
>
>
> Nils
>
>
>
>