External drive doesn't work

I have a new Toshiba external 1TB drive, 2.5 USB 3.0 connector. It works fine with my iMac but the Macbook Air will not connect to it. kernel.log:
Nov 20 14:06:36 Matthews-MacBook-Air kernel[0]: 0        0 AppleUSBCDC: start - initDevice failed
Nov 20 14:06:36 Matthews-MacBook-Air kernel[0]: USBMSC Identifier (non-unique): 2011100620790 0x480 0xa006 0x1
Nov 20 14:06:41 Matthews-MacBook-Air kernel[0]: USBF:          1016. 59          AppleUSBEHCI[0xffffff800b8e5000]::Found a transaction which hasn't moved in 5 seconds on bus 0xfa, timing out! (Addr: 6, EP: 0)
Nov 20 14:06:52 Matthews-MacBook-Air kernel[0]: USBF:          1027. 66          AppleUSBEHCI[0xffffff800b8e5000]::Found a transaction past the completion deadline on bus 0xfa, timing out! (Addr: 6, EP: 2)
Nov 20 14:06:58 Matthews-MacBook-Air kernel[0]: USBF:          1033. 68          AppleUSBEHCI[0xffffff800b8e5000]::Found a transaction which hasn't moved in 5 seconds on bus 0xfa, timing out! (Addr: 0, EP: 0)
Nov 20 14:07:04 Matthews-MacBook-Air kernel[0]: USBF:          1039. 71          AppleUSBEHCI[0xffffff800b8e5000]::Found a transaction which hasn't moved in 5 seconds on bus 0xfa, timing out! (Addr: 0, EP: 0)
Nov 20 14:07:05 Matthews-MacBook-Air kernel[0]: USBF:          1039.103          [0xffffff800ba65e00] The IOUSBFamily is having trouble enumerating a USB device that has been plugged in. It will keep retrying. (Port 3 of Hub at 0xfa100000)
Nov 20 14:07:16 Matthews-MacBook-Air kernel[0]: USBF:          1051. 73          AppleUSBEHCI[0xffffff800b8e5000]::Found a transaction which hasn't moved in 5 seconds on bus 0xfa, timing out! (Addr: 0, EP: 0)
Nov 20 14:07:22 Matthews-MacBook-Air kernel[0]: USBF:          1057. 76          AppleUSBEHCI[0xffffff800b8e5000]::Found a transaction which hasn't moved in 5 seconds on bus 0xfa, timing out! (Addr: 0, EP: 0)
Nov 20 14:07:28 Matthews-MacBook-Air kernel[0]: USBF:          1063. 81          AppleUSBEHCI[0xffffff800b8e5000]::Found a transaction which hasn't moved in 5 seconds on bus 0xfa, timing out! (Addr: 0, EP: 0)
Nov 20 14:07:34 Matthews-MacBook-Air kernel[0]: USBF:          1069. 85          AppleUSBEHCI[0xffffff800b8e5000]::Found a transaction which hasn't moved in 5 seconds on bus 0xfa, timing out! (Addr: 0, EP: 0)
Nov 20 14:07:40 Matthews-MacBook-Air kernel[0]: USBF:          1075. 88          AppleUSBEHCI[0xffffff800b8e5000]::Found a transaction which hasn't moved in 5 seconds on bus 0xfa, timing out! (Addr: 0, EP: 0)
Nov 20 14:07:46 Matthews-MacBook-Air kernel[0]: USBF:          1081. 90          AppleUSBEHCI[0xffffff800b8e5000]::Found a transaction which hasn't moved in 5 seconds on bus 0xfa, timing out! (Addr: 0, EP: 0)
Nov 20 14:07:47 Matthews-MacBook-Air kernel[0]: USBF:          1081.627          [0xffffff800ba65e00] The IOUSBFamily was not able to enumerate a device.
What's up?

Update:
From System Information. Required power is 500mA, and I do believe the MBA can do 1000mA for the SuperDrive, so I doubt power is the issue. This information is available for a little while until the system gives up with "The IOUSBFamily was not able to enumerate a device."
Product ID:          0xa006
Vendor ID:          0x0480 (Toshiba America Info. Systems, Inc.)
Version:          0.01
Serial Number:          2011100620790
Speed:          Up to 480 Mb/sec
Manufacturer:          Toshiba
Location ID:          0xfd120000 / 4
Current Available (mA):          500
Current Required (mA):          500

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