I was on gpsinformation.net and they were comparing the 2610 and the 2620. They said there could be issues using the 2620 on a motorcycle because it has an internal hard drive and the vibration might damage it. Is this true? Don't most GPSs have an internal hard drive besides the 2610. I know a ton of 2610s have been sold to you guys and i was about ready to buy one when i found a good deal on a used 2620. I'm not sure it is as good as the 2610 for a motorcycle, what do you think?