[all variants] File system broken, important files disappeared, help!

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http://ubuntuforums.org – Hi everyone, The other day I let someone with a Mac browse my external hard-drive and copy some files. Then when I plugged in the drive again, almost all of the folders were gone. A few folders are still there (all starting with A and B), but many important folders are missing. When I check how full the drive it, it is just as full as it is supposed to be; it looks like the files aren't deleted but just invisible. Showing invisible files doesn't make them come back. I haven't had a chance to try plugging the drive into a Mac because I don't own one. I badly need to get these (Hardware)