"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).

--
https://www.greenend.org.uk/rjk/

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