After running a disk checker, I have 30 gigs showing as used but unaccounted for anywhere, all the files I moved to an external hdd are still taking up space

I recently purchased a mac book air with the 128g SDD. After setting it up with all my desired applications I started to download some large media files. Knowing that I'm working with limited HDD space I hooked up a portable 1TB Drive, formatted it for MAC OS Extended (journaled) and moved all of my large files onto the back up drive. After moving all the files in my downloads folder to the trash, and then emptying the trash the space on the SDD "Macintosh HD" did not change. Currently reading at used 91g, available 29g (as seen in the disk utility program with the Macintosh HD highlighted). To find the 'mystery used space' I ran a program called 'DIsk Inventory X' on their opening screen the program shows a smaller capacity with 84g used and 27g free, running the program adds up the value of all the folders and applications on the HD only to discover their is only 54g's accounted for (this is realistic for the files and applications I currently have installed and intend to carry with me on a daily basis)
So my question is why is my SDD only filing up and not clearing the space I move to trash and empty, at this rate I won't have any space left.

sounds like the drive may be defective. remember that hardrives can crash at any time even if new and the drives in the air books are just really big flash drives. sound like you have an appointment for the genius bar to get it replaced.
i have one more possible fix but requires you download a free app called "OnyX". if you are not famliar with the power of this app, be carefull about what you have it do. hit me back up if you choose to go this route. other wise to the apple store you go my friend

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