You can just ask random people for quests!
I went to a pub and asked this guy if he had any missions for me. He turned to me with a serious look, said and I quote: “I need you to recover an 8GB white Toshiba flash drive I lost around here yesterday. It has some valuable information, but it’s encrypted, so dont go snooping in. If you find it for me. I’ll make it worth your while.”
Hello I am using them! Well actually I don’t even have bigger than a 4GB. But mostly I use my big box of 508MB usb sticks they do their job fine because rarely I need to transfer something that needs to be together so I just use like 3 or four when I am lazy.