Indeed, this has also happened to me. I have two USB HDDs (a 1TB and a 2TB), a 512GB SD card, and Dropbox. I learned the freakin' hard way. And to the one who uses optical media - no judgement, as I still have a DOS 6.22/Win 3.1 system in great shape (save for a dead 5.25" floppy drive)! LOVE...