On Thu, 18 Mar 2021 10:58:20 +0000, Richard Kettlewell wrote:

> "nelso...@gmail.com"  writes:
>> On Wednesday, March 17, 2021 at 5:15:16 PM UTC-5, Jim Jackson wrote:
>>> On 2021-03-17, nelso...@gmail.com  wrote:
>>> >
>>> > pi@rpi4b:~ $ sync; sync; sudo hdparm -t /dev/sdc /dev/sdc: {8TB 3.5
>>> > HDD 5400rpm}
>>> > Timing buffered disk reads: 100 MB in 3.01 seconds = 33.25 MB/sec
>>> >
>>> That speed looks like it is running at USB2 speeds. Are you sure the
>>> USB adpapter is USB3? Maybe it's USB2
>>
>> Orico SATA3.0 - 6Gbps enclosure  {USB3.0+SATA III; Support capacity
>> 16TB; Support UASP}
>> Seagate Barracuda 8TB HDD
>>
>> It should be as fast as the other drives.
>
> It _should_ be. But it can happen that a fully USB3 configuration can
> still negotiate only USB2. One of my backup drives used to suffer from
> this. Have a look at what appears in the kernel log when you connect the
> drive (I’m afraid I don’t remember exactly what to look for).

The easy way to do that it the open a console and run:

sudo tail -f /var/log/messages

and then connect the drive. You'll get severa;l log lines that give
details about the device that you just plugged in, and what USB type
(USB2, USB3) its connecting as.

Kill 'tail' by typing Ctrl/C  when you've finished.



--
Martin    | martin at
Gregorie  | gregorie dot org

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