OP, I can see why you'd think tech would be great for things like this, but I believe it'll be a bad habit in the long run. If all of your notes are stored electronically, what will you when data is corrupted or when your device breaks? You sure as heck won't spend thousands to recover notes. I reccommend doing it the old fashioned way... with a pen/pencil and a notebook.
I can't see why your notes would be under your bed or in the trash.... unless you're using loose leaf? Try using a ringed notebook, like those college-ruled ones. For one, you can write larger in a notebook than you can with your iPad/S3 device.
You can edit mistakes more easily in a notebook ('precision' erasing).
So it's not quite the answer you wanted to here...