I have a DriveStation Duo mirrored at 1TB, formatted Mac OS Extended so we can copy large movies to it. There's only one folder on the drive that's 750GB, but the entire drive reports it only has 19GB free. So we deleted a bunch of files and the free space didn't increase. I ran Apple's Disk Utility on it and it didn't find anything wrong. I looked at the hidden files on the drive and those accounted for less than 1MB total, so that's not it. Any ideas?
