Yes, any external USB drive will work. The small portable ones are best as most don't require an AC adapter to work with the eDGe (for example, the Western Digital Passport drives). If your drive comes with a Y cable, you'll probably need to plug it into both USB ports to provide sufficient power to the drive. Some forum members have reported that some small portable drives do need separate AC power to run, but I can vouch that the WD Passport ones don't.
Bear in mind that external drives will reduce the battery runtime of the eDGe.
You may want to consider large USB memory sticks instead - something like a 32 Gb or 64 Gb one. These don't draw the same amount of power as a hard drive.
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