Does MBA M1 support USB UASP?

The slow NVme USB speeds is a fairly wide spread issue on the new M1

Macs and does not seem to have anything to do with protocols but

how the Thunderbolt4/USB4 ports are configured.

The folks at OWC have been taking a look at the issue and have discovered

some interesting things. They have two blog postings. The first is where

they discovered some things and the second even further research into

the phenomenon;

https://eshop.macsales.com/blog/74383-faster-drive-performance-with-m1-mac/

the second:

https://eshop.macsales.com/blog/74383-faster-drive-performance-with-m1-mac/

Proves to be some eye opening reading.

I miss the days of Firewire. Well hopefully enough will give Apple Feedback they will see the need to push more data on USB-C. We need it just for backup purposes.

http://www.apple.com/feedback

Not everyone has a fiber channel connection to the Cloud.

Unlikely, https://www.reddit.com/r/applehelp/comments/3vhcnt/how_do_i_know_if_my_imac_supports_the_uasp/cxnlxl9/

indicates it wasn't even supported under El Capitan.

Asante was one of the last companies to bridge SCSI support. You may want to contact them and see if the ethernet option or another might be better.

Based on what limited info I have, Apple must have dropped it as soon as they added it, because only 3 OS releases later the link I posted shows it is not built-in anymore.

Only four Mac OS X versions, all PowerPC had true SCSI support built-in. 10.0, 10.1, 10.2 and 10.3. After 10.2.8, no Mac OS X could be installed on a beige G3 or 10.3.9 on a so-called Lombard Powerbook G3 with built-in 30 pin SCSI.

USB ported SCSI drivers weren't there on 10.11 according to the link I posted in my reply.

So I would imagine any SCSI support whether it is PCI card based, or USB based will have to come from the third party drivers.

Driver support on Catalina and later are much different than 10.8 to 10.11, as Apple made the whole operating system 64 bit. Your M1 can't be downgraded to a 32 bit operating system.

That's interesting. Sounds like something is either underpowered in the USB bus, or draining some of its bandwidth.

Apple menu -> About This Mac -> System Report -> Hardware -> USB will help you determine what else is on the bus.

Anything slower than your current USB on the same bus will cut the bandwidth of USB.

USB also is affected by the processor speed. Thus if you are using a lot of processor bandwidth to adapt to Rosetta in the background, you could be slowing yourself down.

a brody wrote:

I miss the days of Firewire. ...

USB-C may have been a good idea to only have one connector

fits all but having one interface that has to support a myriad of protocols

and support a variety of powering capabilities is just creating a world

of complexity and with it a huge number of opportunities for things to

not work up to snuff and just outright fail. USB itself has blown out to almost

a dozen differing protocols all of which need to be cross compatible, i.e.

USB 2 devices still have to work with USB 4.

pblix wrote:

Thank you for the reply, this is very interesting reading. But the links seems to be the same for both first and second, is it possible to get the link to the second blog posting you refer to?

Doh!

Here it is:

https://eshop.macsales.com/blog/74780-faster-external-drive-speed-m1-mac/

I have the same issue. My speeds using a usb 3.2 enclosure with nvme drive gets 900 mbps on iMac and only 600 on my MBA M1. No issue with TB drives.

Not just me. This is an issue with all the MBA M1Macs. Many have reported this issue. I'm not too concerned because I have switched to all TB drives which work as expected.