[ubuntu] missing free space on external drive

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http://ubuntuforums.org – hey I have an external drive that's messing up and missing free space. in property's it reads total capacity as 931.5GB 931.5GB's used and 72.0KB free space but the total files in the drive only come to 442.2GB's worth of data and I tried deleting a few things, then emptying the garbage bin and no the free space stayed at 72.0KB tried unmounting then mounting tried rebooting, nothing has worked so far. any ideas? (Hardware)