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Usb 2 / 3?

D

disasterdrone

macrumors 6502
Original poster
Aug 31, 2013
300
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So I connected a drive to a USB 3 port. How do I tell what speed the drive is operating at without doing a test transfer and timing it? Is there any way to get a report of what speed of drive is connected to what port?
Thanks!
 
disasterdrone said:
So I connected a drive to a USB 3 port. How do I tell what speed the drive is operating at without doing a test transfer and timing it? Is there any way to get a report of what speed of drive is connected to what port?
Thanks!
Click to expand...

Yeah in the system profile menus

Should add... Goto..Apple Menu (top left of screen) > About This Mac, and then click More Info.
 
Macs only come with either USB 2.0 (2011 and earlier) or 3.0 (2012 and later) ports, not both. So if you have a USB 3.0 device, it should work at full speed when connected to any port on your computer.
 
saturnotaku said:
Macs only come with either USB 2.0 (2011 and earlier) or 3.0 (2012 and later) ports, not both. So if you have a USB 3.0 device, it should work at full speed when connected to any port on your computer.
Click to expand...

Thanks - I know the port is USB 3, I want to know whether the drive connected to it is being recognized and used as a USB3 drive, or connecting as a USB2 drive (the port operates in legacy mode for compatibility).
Thanks!
 
As OP noted, look at the USB entry for System Profiler. Negotiated connection speed will be indicated.

So, if a connected USB 3.0 device connects, and only negotiates a USB 2.0 connection, indicated connection speed will be 480Mbps.

This can happen with faulty firmware, low-quality cables, wrong cables and/or a combination of those factors.
 
g4cube said:
As OP noted, look at the USB entry for System Profiler. Negotiated connection speed will be indicated.

So, if a connected USB 3.0 device connects, and only negotiates a USB 2.0 connection, indicated connection speed will be 480Mbps.

This can happen with faulty firmware, low-quality cables, wrong cables and/or a combination of those factors.
Click to expand...

Thank you - I misunderstood the OP - appreciate it!
 
I'd like to know the following scenario: suppose I buy an USB3 hub and connect to it one USB3 device and one USB2 device. Is the port capable of providing USB3 speeds to the USB3 device?
 
brdeveloper said:
I'd like to know the following scenario: suppose I buy an USB3 hub and connect to it one USB3 device and one USB2 device. Is the port capable of providing USB3 speeds to the USB3 device?
Click to expand...

My suspicion is that this is going to depend on the specific hub.
 
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