I've been looking through the specs of my 2014 MacBook Air in order to resolve a certain issue.
The hub speed cought my attention:
BRCM20702 Hub:
Product ID: 0x4500
Vendor ID: 0x0a5c (Broadcom Corp.)
Version: 1.00
Speed: Up to 12 Mb/sec
Manufacturer: Apple Inc.
Location ID: 0x14300000 / 4
Current Available (mA): 500
Current Required (mA): 94
Extra Operating Current (mA): 0
Built-In: Yes
The speed is 12 megabits per second, right?
How do I get a USB disk data transfer speed of about 10 megabytes per second? To make it funnier, the peak speed is about 50M, but that is just buffering. The actual average long-term large-volume speed is about 10M.
Also, the hub speed is a USB 1.X speed, while the body features USB 3 ports. What's the catch?
Edit:
Here's the data for the dock connected over a USB 2 cable:
JMS56x Series:
Product ID: 0x9561
Vendor ID: 0x152d (JMicron Technology Corp.)
Version: 1.05
Serial Number: 00000000000000000000
Speed: Up to 480 Mb/sec
Manufacturer: JMicron
Location ID: 0x14200000 / 22
Current Available (mA): 500
Current Required (mA): 2
Extra Operating Current (mA): 0
The dock is under the USB 3.0 bus (no speed specified):
USB 3.0 Bus:
Host Controller Driver: AppleUSBXHCILPT
PCI Device ID: 0x9c31
PCI Revision ID: 0x0004
PCI Vendor ID: 0x8086
The slowest disk is 5400 RPM Toshiba HDWL120. It's transfer speed is "non-public" (weird). It should be much higher than 10 MB/s though.