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You can utilize any external Hard Drive that meets the following requirements:
- 7200 RPM rotation speed
- Between 40 and 750GB of capacity
- Holds a single hard drive (enclosures holding 2 disks are not supported)
- Plugs into an AC power outlet
- USB 2.0 connection
- No sleep mode (cannot power down when idle)
May I suggest This one.
If you go for the 750GB Drive you'll be able to store 500 Hours of standard def video or 100 hours of HD.
Sadly, Bell receivers use a proprietary file format/OS that is incompatible with home computers, meaning you can't use the external drive to transfer Movies or TV shows to your computer. 
For unequaled storage capacity though, the external Hard Drive is the way to go. Turning your receiver into a PVR is awesome. Highly recommended!
