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Catalina: USB 3 Drive. USB 3.1 Port. USB 3.1 SSDT. USB 2 Speeds

Joined
Aug 5, 2012
Messages
12
Motherboard
Gigabyte z390 Aorus Pro
CPU
i9-9900K
Graphics
RX 570
Mac
iMac, MacBook, MacBook Pro, Mac mini
Mobile Phone
iOS
So as far as I can tell everything is working as it should. I plug in my USB3 Flash drive but when I transfer a large file to it, It is SLOW. Well, slower than USB 3 should be. Any help would be appreciated.

The Samsung drive on my desktop is USB 3 and it is recognized as such in System Information as you see here.
Screen Shot 2019-11-05 at 5.11.55 PM.png


Attached are my SSDT and my Config. My build is the same as listed in my profile. Gigabyte Z390 Pro.
 

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Joined
Nov 5, 2019
Messages
7
Motherboard
Gigabyte Z389 M Gaming, 16Gb RAM (HyperX 3200Mhz)
CPU
Intel i9-9900K
Graphics
Pulse RX 590 8Gb + UHD 630
So as far as I can tell everything is working as it should. I plug in my USB3 Flash drive but when I transfer a large file to it, It is SLOW. Well, slower than USB 3 should be. Any help would be appreciated.

The Samsung drive on my desktop is USB 3 and it is recognized as such in System Information as you see here.


Attached are my SSDT and my Config. My build is the same as listed in my profile. Gigabyte Z390 Pro.
If you haven't yet figured it out, see these posts, they helped me to set correctly the USB3 in my system.

- macOS Catalina 10.15.0 - USB Port-Limit Removal Patch

- A Beginner's Guide to Creating a Custom USB SSDT

- (updated!) The New Beginner's Guide to USB Port Configuration
 
Last edited:
Joined
Aug 5, 2012
Messages
12
Motherboard
Gigabyte z390 Aorus Pro
CPU
i9-9900K
Graphics
RX 570
Mac
iMac, MacBook, MacBook Pro, Mac mini
Mobile Phone
iOS
If you haven't yet figured it out, see these posts, they helped me to set correctly the USB3 in my system.

- macOS Catalina 10.15.0 - USB Port-Limit Removal Patch

- A Beginner's Guide to Creating a Custom USB SSDT

- (updated!) The New Beginner's Guide to USB Port Configuration
Thank you for your help!

So I still haven't FULLY figured it out. I haven't worked very hard at it either tho.. BUT where I am at now...

So USB 3 IS working... but HFS and APFS file systems are SLOW for some reason. When I format the drive to NTFS THEN I get USB 3.1 speeds.

Hopefully, this will help someone who is pulling their hair out to look somewhere else for the solution. Because I have a custom SSDT already and System Report sees a USB 3 drive AS USB 3. If you are have gotten that far and you're still getting slow speeds, look for solutions on Apple's file systems. If I find something I will report it back here.
 
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