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I have a Western Digital MyBook 1.5TB external USB 3.0 drive, which I've been using with Ubuntu 12.10 through a PCI Express USB 3.0 adapter. However, while trying to determine why the transfer speeds are slow, I discovered that the system is connecting to the device through a USB 2 bus. lsusb shows that my USB 3.0 hub is on Bus 010, while the disk itself is attached to Bus 009.

$ lsusb
Bus 001 Device 003: ID 0424:2504 Standard Microsystems Corp. USB 2.0 Hub
Bus 004 Device 002: ID 06a3:0b6a Saitek PLC 
Bus 008 Device 002: ID 046d:c01d Logitech, Inc. MX510 Optical Mouse
Bus 009 Device 005: ID 1058:1140 Western Digital Technologies, Inc. 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 009 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 010 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub

I have confirmed that the disk is physically plugged in to the correct USB port on my computer. It would make sense that the USB3 adapter has a second USB2 bus built in for backwards compatibility, but I can't figure out why my hard drive would be reverting to that bus.

Here is the full lsusb -v output: http://pastebin.com/9iBjJVL4

Any help is much appreciated.

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