I have a couple of Disney gc's (the kind you buy at Target) -- they have the upper part with the hang tag and the bar code, and then you can break them off and have the regular credit-card sized gift card with the mag stripe. I started breaking them all apart for ease of transport, and then I realized that the bottom gift card part doesn't have the dollar amount or a bar code on it anywhere. Is there any reason to leave them attached to take them to the parks? I can write the amount on with a sharpie so I know (they're all different). The bar code is just for activation in the store, right? No reason I would need that? So it's ok to keep breaking them apart and tossing the top section?