Toshiba backup drive not recognized when plugged into thunderbolt display.

My Toshiba backup drive does not mount to my MacBookPro when plugged into my Thunderbolt Display. It works beautifully when plugged directly into my MBP, and other USB devices work beautifully when plugged into the same USB ports on the Thunderbolt Display.
All my equipment is pretty new. The Toshiba is currenlty configured to be my Time Machine back up drive.
Laptop: 15" Macbook Pro, 2.8 GHz Intel Core i7, 16 GB 100 MHz DDR3, Mac OS 10.8.5
Backup Drive: Toshiba 500GB Canvio® Basics USB 3.0 Portable Hard Drive
Apple Thunderbolt Display: 2560 x 1440, NVIDIA GeForce GT 650M 1024 MB graphics
When I plug the backup drive into the TB Display, usually nothing happens. The blue light on the drive doesn't come on, and it doesn't mount to the desktop. If I wiggle the USB back there, sometimes the blue light will come on, and sometimes it will mount for a minute then go away. This is true for all 3 USB ports. I have not had problems with any other USB devices, but the only other ones I've plugged into the Thunderbolt are my keyboard, bluetooth headset charger, and other items that probably use less power than the backup drive.

But the cable works when plugged into my laptop. Plus, the cable connection is pretty specific to the device; I'm not sure if you can buy another one seperately.

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