An anonymous reader writes "Most people use MS filesystems on Disk-On-Keys, and portable hard drives, as these are readable from most machines. But this way you lose the files' permission information, which many times is very inconvenient (you must agree that having Ubuntu asking you whether to execute or display every text file or image you open from a DOK is annoying). Using 'regular' Linux filesystems like ext keeps the permissions, but may require using the superuser when switching machines (as the UIDs are different). So do any of you have a creative solution for this problem?"