Best buy has this today only. I have the same drive and it works great with the 622. No problems to date.
Buy.com - Cavalry 500GB 3.5'' 7200RPM USB 2.0 External Hard Drive with One Touch Back-Up - CAUM37500
Cavalry 500GB 3.5" 7200RPM USB 2.0 External Hard Drive w/ One Touch Back-Up
Just one touch, and you’ll be hooked! The Cavalry offers One Touch back-up data file operation at your fingertips. To back up your files, just press the one touch back-up button for a few seconds and all of your files are safe and secure. This external hard drive boasts exceptional heat dissipation, remarkable durability, state-of-the art shock absorption, leading-edge versatility and superior all-around performance. more info
LIST PRICE: $102.00 FREE SHIPPING
Buy.com - Cavalry 500GB 3.5'' 7200RPM USB 2.0 External Hard Drive with One Touch Back-Up - CAUM37500
Cavalry 500GB 3.5" 7200RPM USB 2.0 External Hard Drive w/ One Touch Back-Up
Just one touch, and you’ll be hooked! The Cavalry offers One Touch back-up data file operation at your fingertips. To back up your files, just press the one touch back-up button for a few seconds and all of your files are safe and secure. This external hard drive boasts exceptional heat dissipation, remarkable durability, state-of-the art shock absorption, leading-edge versatility and superior all-around performance. more info
LIST PRICE: $102.00 FREE SHIPPING