bnoone: If you travel a (ridiculous...) lot, you can copy all your disk images on a single memory stick for that purpose.
Last year or so I tried to make a disk image of my original Heavy Gear CD, just because I hated the loud whirl sound it made on my old laptop's CD-ROM drive. I figured it should be very straightforward, it being so old game and all. But it wasn't, I tried several well-known CD-image applications, and none made a working image of it at least with the default settings, nor could I figure out easily what would be the correct settings.
I think I found some instructions with google how to make one, but the instructions were a bit complicated, so I couldn't be arsed to do it. So I listened to the loud CD whirl sound when I was playing Heavy Gear.
Then again, what's the point of the physical games, if you are going to make CD images of them anyway? :)
That said, I have earlier carried some CD sleeve packs with like 50 PC game CDs in them with my laptop, when I was travelling around. But nowadays I wouldn't be arsed to do that anymore.