Let me tell you a story about an external hard drive that I have. Still have. 320gb WD external USB, 'bout the size of a pack of Vegas playing cards.
At home I plug it into a fileserver as a USB drive. Happy day, other computers can use it. It has a bunch of junk on it. I backed up my DVD iso collection onto it for "safekeeping" one day, and then since I didn't need those 8gb files stored redundantly on my laptop I deleted all but a choice few. These files were, for sake of discussion, file archives of DVD movies that I own on disc even though few (if any) of the iso images were created by myself and most (if not all) came to me in torrent form. I needed the drive to be, on occasion, portable. Thats why I bought an external drive. I needed the drive to connect to Windows computers when portable, and I needed a file system capable of storing huge files. So I formatted the drive as ntfs. One big partition.
See where the story is going?
So one day this XP computer has a barfbag attack and decides that my drive cannot be mounted. Linux says "your drive be scragged, find an XP box and run chkdsk a lot". So I did so, running chkdsk and rebooting to run chkdsk again (rinse, repeat) until XP was happy with the drive. Then the drive could be mounted, unmounted, moved, remounted, etc all without any problems. Except one. One folder didn't survive the ordeal.
Guess which one:
Care to guess what ELSE might be stored in a folder set aside for backing up isos? Disc images, created by myself, of legal installs of XP and Vista that I use on occasion for creating Vbox sessions when I need to create one from scratch.
Yeah, so about those plans to keep this one ginormous partition full of all your favorite stuff.
All I lost was bandwidth and time. I can visit isohunt or thepiratebay and find any file that was lost in my debacle. Even the XP and Vista images.