HELP! My MacBook Air sucked dry 142.5GB out of 256GB SSD space!!!

I use DaisyDisk and found out that I've lost 142.5GB out of 256GB SSD space being hidden as displayed in the attach captured image.
Can someone tell me how you resolve this issue and retrieve back the hidden disc space? Why are they hidden and used up so much of space? I do Time Machine backup every night I get back home. It never happen to my MacBook Pro... Pls help!...

Well, I went into the Disk Utility and veryfy the drive and the error messages appeared as per the attach captured image below:
I then restart the computer and hold down "Command+R" till the "Apple Logo" appears and releases the keys.
I selected the bottom most option (Disk Repair) and selected the volume and clicked "Repair Disk". Within 5 mins, the (green color) message reads "Your disk repaired successfully" and I gain back all my lost/hidden spaces to what I should be getting...
Kappy, thanks for your prompt reply. Really appreciated it. Cheers!

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My MacBook Air tells me I'm out of memory. to my knowledge I use only 65 GB for documents, photos, videos, apps, and it tells me that 75 GB is taken by "other" What is in other, and how can I fix it?

my MacBook Air tells me I'm out of memory. to my knowledge I use only 65 GB for documents, photos, videos, apps, and it tells me that 75 GB is taken by "other" What is in other, and how can I fix it?

For information about the Other category in the Storage display, see this support article. If the Storage display seems to be inaccurate, try rebuilding the Spotlight index.
Empty the Trash if you haven't already done so. If you use iPhoto, empty its internal Trash first:
iPhoto ▹ Empty Trash
Do the same in other applications, such as Aperture, that have an internal Trash feature. Then restart the computer. That will temporarily free up some space.
According to Apple documentation, you need at least 9 GB of available space on the startup volume (as shown in the Finder Info window) for normal operation—not the mythical 10%, 15%, or any other percentage. You also need enough space left over to allow for growth of the data. There is little or no performance advantage to having more available space than the minimum Apple recommends. Available storage space that you'll never use is wasted space.
When Time Machine backs up a portable Mac, some of the free space will be used to make local snapshots, which are backup copies of recently deleted files. The space occupied by local snapshots is reported as available by the Finder, and should be considered as such. In the Storage display of System Information, local snapshots are shown as Backups. The snapshots are automatically deleted when they expire or when free space falls below a certain level. You ordinarily don't need to, and should not, delete local snapshots yourself. If you followed bad advice to disable local snapshots by running a shell command, you may have ended up with a lot of data in the Other category. Ask for instructions in that case.
See this support article for some simple ways to free up storage space.
You can more effectively use a tool such as OmniDiskSweeper (ODS) or GrandPerspective (GP) to explore the volume and find out what's taking up the space. You can also delete files with it, but don't do that unless you're sure that you know what you're deleting and that all data is safely backed up. That means you have multiple backups, not just one. Note that ODS only works with OS X 10.8 or later. If you're running an older OS version, use GP.
Deleting files inside an iPhoto or Aperture library will corrupt the library. Any changes to a photo library must be made from within the application that created it. The same goes for Mail files.
Proceed further only if the problem isn't solved by the above steps.
ODS or GP can't see the whole filesystem when you run it just by double-clicking; it only sees files that you have permission to read. To see everything, you have to run it as root.
Back up all data now.
If you have more than one user account, make sure you're logged in as an administrator. The administrator account is the one that was created automatically when you first set up the computer.
Install the app you downloaded in the Applications folder as usual. Quit it if it's running.
Triple-click anywhere in the corresponding line of text below on this page to select it, then copy the selected text to the Clipboard by pressing the key combination command-C:
sudo /Applications/OmniDiskSweeper.app/Contents/MacOS/OmniDiskSweeper
sudo /Applications/GrandPerspective.app/Contents/MacOS/GrandPerspective
Launch the built-in Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
Paste into the Terminal window by pressing command-V. You'll be prompted for your login password, which won't be displayed when you type it. Type carefully and then press return. You may get a one-time warning to be careful. If you see a message that your username "is not in the sudoers file," then you're not logged in as an administrator. Ignore any other messages that appear in the Terminal window.
The application window will open, eventually showing all files in all folders, sorted by size. It may take a few minutes for the app to finish scanning.
I don't recommend that you make a habit of doing this. Don't delete anything as root. If something needs to be deleted, make sure you know what it is and how it got there, and then delete it by other, safer, means. When in doubt, leave it alone or ask for guidance.
When you're done with the app, quit it and also quit Terminal.

Left my macbook air to dry over night then turned it on, should i keep waiting for it to dry?

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Also i have not yet told my parents because they would kill me as they got me this macbook as a well-done-on-your-grades reward!

I understand and sympathize with you.
But from a technical point of view, liquid damage is progressive.
If I had other helpful tips, I would have shared those with you.
Best.

I HAVE BEEN USING MID 2011 MACBOOK AIR 11 INCH.I AM LOSING MY HARD DRIVE SPACE WITHOUT ANY REASON.FIRST IT WAS 84.1 GB NOW IT IS 83.9 AND SLOWLY LOSING SPACE.WHY IS THAT?? PLS PLS HELP

I have macbook air mid 2011 .. Now i am losing my hard drive space without any apparent reason..I am not downloading anything not i am adding anything still that i am losing my hard drive space for no apparent reason..pls pls help..

I have never heard of a relation between the enabled state of Time Machine, and boot. Its probably coincidental.
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I guess I have a few comments.
Apple has an opt out.. they do not support Time Machine backups on older Airport Extreme. Apple have always stated it is unreliable and so refused to support it.. only with Gen6 of the AE have they changed to supporting TM backups.
From your point of view it should have worked.. it may indeed still work. But the change of network is significant and it will take some work on your part.
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See A4 here. http://pondini.org/TM/Troubleshooting.html
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see B5 and B6
4. It is also possible to move old backups into a new backup.. but this is then going too far.
I would simply buy a new USB drive.. and keep the old backup drive for a few months until your new one builds up sufficient history to be sure you will not need the old ones.. at that point you can use the old backup drive again after a reformat.
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HELP! My MacBook Air sucked dry 142.5GB out of 256GB SSD space!!!

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