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Not sure if this belongs under Hardware or Software. The situation: Win 7 32-bit. 2TB Hard Drive. 900GB full, 960GB free (48% used). Wasn't very fragmented. Ran TuneUp Utilities 2010 Thorough Disk Defrag. Now only 127GB free. Windows Explorer and xplorer2 say so. TuneUp Disk Space Explorer says total filesize = 900GB, but also says only 127GB free. I have run chkdsk, checked for Restore Points, Shadow copies, Disk images, page file, hidden files... I can't figure out why the system thinks the space is used, but no files taking up that space. I have spent hours reading about similar issues, but still no fix. It may or may not be related, that this OS install has a bad corruption in device and USB Driver handling and possibly ntkrnlpa.exe. Also, when accessing an external drive, folders show up, but no files. Plugged into a different pc, and the files are there. I will have to re-install win7 soon, but I need to make partition images as a safety net. And to do that, I need my storage+backup drive. The reason I ran the checks and defrag originally is because Acronis failed to make backup image, stating 'bad sector'. Why is the disk reporting full, when it isn't; and how do I fix it? Thank you.