Hej Benny!

Cutting and pasting for stats;

# writing to onboard uSD card using dd
  dd if=/dev/zero of=test.dd bs=1M count=512
  512+0 records in
  512+0 records out
  536870912 bytes (537 MB, 512 MiB) copied, 58.4449 s, 9.2 MB/s

# writing to usb connected msata using dd
  dd if=/dev/zero of=test.dd bs=1M count=512
  512+0 records in
  512+0 records out
  536870912 bytes (537 MB, 512 MiB) copied, 12.8056 s, 41.9 MB/s

# writing to usb connected 2.5" laptop drive using dd
  dd if=/dev/zero of=test.dd bs=1M count=512
  512+0 records in
  512+0 records out
  536870912 bytes (537 MB, 512 MiB) copied, 12.9187 s, 41.6 MB/s

Both the msata and the 2.5" laptop drive are 4 times faster than the uSD.  
However it should be noted that there is an issue with the usb sata bridge that 
states;

[  139.399549] usb 1-1.2: The driver for the USB controller dwc_otg_hcd does 
not support scatter-gather which is
[  139.399569] usb 1-1.2: required by the UAS driver. Please try an other USB 
controller if you wish to use UAS.

However it wasn't fatal as demonstrated by the dd write to the drive mounted on 
the JMS567 SATA 6Gb/s bridge, but after witnessing this I will continue to use 
the 2.5" laptop drive given that there are no such errors on there and the 
results were just as good.  Hopefully newer raspberry pi's will ditch the uSD 
interface and put on a msata or m.2 controller/interface in the future.  uSD's 
should be left to crippled hardware as people who use those devices don't seem 
to mind (over)paying for utter crap.  ;-)

I won't even mention the onboard wifi.  More useless crap that is a drain on 
the system.  :::sigh:::

Anyhow, for the record, the same test on a usb3.0 interface;

# writing to usb3 connected msata using dd
  dd if=/dev/zero of=test.dd bs=1M count=512
  512+0 records in
  512+0 records out
  536870912 bytes (537 MB, 512 MiB) copied, 1.13874 s, 471 MB/s

MUCH BETTER!!!  :-)

Hopefully you'll have better results with the addon card.  One thing for sure 
is that msata is a vast improvement over the onboard uSD and is worth the extra 
investment.

Livet er godt,
Maurice

... En Møøse slog engang min søster ...
--- GNU bash, version 5.0.2(1)-release (aarch64-raspi3b+-linux-gnu)