I'm facing a VERY STRANGE issue since today. I use a Western Digital 320 GB external portable hard disk as my backup drive. I store my Movies, Music, TV shows etc in this. Yesterday, I connected both my external hard disks (the primary one being a 500 GB Buffalo) and transferred a folder containing video files onto the Western Digital. I do this almost everyday, as a backup measure, without any issues till date. I also always use the 'Safely Remove Hardware' option before unplugging the hard disk. Today when I plugged in this disk, I was shocked to see that all files are gone! The Properties tab shows space as used up (i.e. 292 GB used out of total 297 GB) and all folders are intact (ref screenshot). But there aren't ANY files there! This happened under Ubuntu 11.10. So I switched back to Windows 7 and enabled the 'Show Hidden files and folders' option but to no avail. I ran a disk test and it is perfectly healthy. I also ran 'Recuva' - a free software to recover deleted/corrupted files. It does show me about 80% of the missing files but still the remaining critical 20% are nowhere to be found. What could be the problem and solution here?